{"title":"Big Bore Kits","description":"\u003cp\u003eBig Bore kits for all makes of the Honda 50, xr, crf, z, z50, xr50, and crf50. Also manual clutch kits, high volume oil pumps, and everything else needed to make your 50 faster!\u003c\/p\u003e","products":[{"product_id":"392-88cc-stage-2-vintage-big-bore-kit-for-honda-z50-and-ct70","title":"88cc stage 2 Vintage big bore kit for honda z50, ct70, atc70, trx70, sl70, xl70","description":"\u003cp\u003e\u003cstrong\u003eVintage Stage 2 88cc Big Bore kit and 20mm Carburetor Kit:\u003c\/strong\u003e\u003cbr\u003e- Fits 1968-1981 honda z50, ct70, atc70, trx70, sl70, xl70\u003cbr\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- High compression 52mm piston with rings, pin, \u0026amp; clips (you can still run pump gas)\u003cbr\u003e- Head gasket kit, all gasket included needed for install.\u003cbr\u003e- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mount hardware\/wrench, air filter, throttle cable\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eThis is a great kit to pump up your old Honda 50 or 70. This kit will easily double the stock horse power on your bike.\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"68-81 ct70","offer_id":51840930611501,"sku":"4447A2-V1","price":244.99,"currency_code":"USD","in_stock":false},{"title":"69-81 z50","offer_id":51840930644269,"sku":"4447A2-V2","price":244.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10291.jpg?v=1771874849"},{"product_id":"395-88cc-race-head-vintage-big-bore-kit-for-honda-z50-and-ct70","title":"88cc Race Head Vintage big bore kit for honda z50 and ct70","description":"\u003cp\u003e50 Caliber Racing Race Head, 88cc Big Bore kit, and 20mm Carburetor\u003c\/p\u003e\u003cp\u003eOur Race Head has been updated for even more performance! It now has 25\/22mm valves with better porting\/flow. We also kept the combustion chamber the same size and changed the angle of the valves slightly. This will really wake up your stock engine and is comparable in power to the much larger Chinese 124cc engines! Includes the following:\u003c\/p\u003e\u003cp\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- 52mm high compression piston with rings, pin, \u0026amp; clips\u003cbr\u003e- Head gasket kit\u003cbr\u003e- High performance race camshaft and Honda cam sprocket\u003cbr\u003e- Race Head – Larger valves (now 25\/22mm) and better flow for increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled! NEW! 06\/08 - The exhaust valve has been upgraded to stainless steel (21-4N material).\u003cbr\u003e- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting hardware\/wrench, long adjustable throttle cable, and an air filter. \u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"68-81 ct70","offer_id":51840930677037,"sku":"4448A1-V1","price":409.99,"currency_code":"USD","in_stock":false},{"title":"69-81 z50","offer_id":51840930709805,"sku":"4448A1-V2","price":409.99,"currency_code":"USD","in_stock":false},{"title":"82 91-94 ct70","offer_id":51840930742573,"sku":"4448A1-V3","price":409.99,"currency_code":"USD","in_stock":false},{"title":"88-91 z50","offer_id":51840930775341,"sku":"4448A1-V4","price":409.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10280.jpg?v=1771874850"},{"product_id":"403-52mm-and-54mm-head-gasket-kit","title":"52mm Head gasket kit","description":"\u003cp\u003e\u003cstrong\u003e52mm (88cc -108cc) and 54mm (117cc) Head gasket kit\u003c\/strong\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"52mm","offer_id":51840930873645,"sku":"5402","price":16.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/291.jpg?v=1771874851"},{"product_id":"406-head-gaskets-47mm-and-52mm-for-lifan-engines","title":"Head gaskets 47mm and 52mm for Lifan Engines,","description":"\u003cp\u003e47mm or 52m head gasket kit\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"47mm 70cc","offer_id":51840930939181,"sku":"5403-V1","price":11.0,"currency_code":"USD","in_stock":true},{"title":"55mm 110-125cc","offer_id":51840930971949,"sku":"5403-V2","price":11.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/294.jpg?v=1771874852"},{"product_id":"410-performance-intake","title":"Performance Intake","description":"\u003cp\u003eThe intake side center to center bolt holes are 49mm apart.\u003cbr\u003eThe air filter side is of the carburetor opening is 32mm.\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"race head","offer_id":51840931004717,"sku":"4448A10","price":32.0,"currency_code":"USD","in_stock":true},{"title":"stock head","offer_id":51840931037485,"sku":"4448A9","price":32.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/298.jpg?v=1771874853"},{"product_id":"575-88cc-stage-1-vintage-big-bore-kit-for-honda-z50-ct70-atc70-trx70-sl70-xl70","title":"88cc stage 1 Vintage big bore kit for honda z50, ct70, atc70, trx70, sl70, xl70","description":"\u003cp\u003eVintage Stage 1 88cc Big Bore kit\u003c\/p\u003e\u003cp\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- High compression 52mm piston with rings, pin, \u0026amp; clips (can still run pump gas)\u003cbr\u003e- Head gasket kit includes all gasket needed to install bore kit.\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e \u003c\/p\u003e\u003cp\u003eThis is a great inexpensive way to pump up your old Honda 50 engine. This kit is recommended for those who dont want to spend a fortune but still want to see a nice power increase over the stock engine. This kit can be installed by anyone with basic mechanical skills that is not afraid to turn some nuts and bolts.\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"68-81 ct70","offer_id":51840933429549,"sku":"4446A2-V1","price":155.0,"currency_code":"USD","in_stock":false},{"title":"69-81 z50","offer_id":51840933462317,"sku":"4446A2-V2","price":155.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10273.jpg?v=1771874869"},{"product_id":"232-gasket-kit-complete-52mm-110-125cc","title":"Gasket kit complete 52mm 110cc - 125cc","description":"\u003cp\u003e\u003cspan id=\"btAsinTitle\"\u003e50 Caliber Racing 52mm Gasket kit for 88cc, 110cc, and 125cc Lifan Engines Pit Bikes Atv Pocket Bike Go Karts and Mini Choppers\u003cbr\u003e\u003cbr\u003e- Fits 88cc-125cc engines using a 52mm cylinder\u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840958726445,"sku":"4410","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/90.jpg?v=1771875084"},{"product_id":"233-gasket-head-52mm-110-125cc","title":"Gasket Head 47mm 70cc","description":"\u003cp\u003e\u003cspan id=\"btAsinTitle\"\u003e50 Caliber Racing 47mm Head Gasket Kit for 70cc Pit Bikes. This 47mm gasket kit will work on all 47mm lifan and honda engines. \u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840959054125,"sku":"4402","price":10.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/89.jpg?v=1771875085"},{"product_id":"237-gasket-head-52mm-110cc-125cc","title":"Gasket Head 52mm 110cc-125cc","description":"\u003cp\u003e\u003cspan id=\"btAsinTitle\"\u003e50 Caliber Racing 52mm Head Gasket Kit for 110cc and 125cc Pit Bikes Atv Pocket Bike Go Karts and Mini Choppers\u003c\/span\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840959086893,"sku":"4403","price":10.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/88.jpg?v=1771875087"},{"product_id":"238-gasket-kit-complete-47mm-70cc","title":"Gasket kit Complete 47mm 70cc","description":"\u003cp\u003e\u003cspan id=\"btAsinTitle\"\u003e50 Caliber Racing 47mm Gasket kit for 70cc Lifan Engines Pit Bikes. This is a complete top end gasket kit to help you rebuild your 47mm top end (70cc)  You will receive every gasket shown in the picture above. \u003cbr\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840959119661,"sku":"4404","price":15.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/86.jpg?v=1771875088"},{"product_id":"303-honda-xr-crf-50-rev-box","title":"Honda xr crf 50 rev box","description":"\u003cp\u003e50 Caliber Rev Box. This rev box will remove the stock rev limiter and allow your pit bike to max out its performance and rpm's. Improved timing curve. Great bang for the buck! Fits all years of Honda xr50 and crf50. This is a must have to max out your engines capabilities!\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840959971629,"sku":"5300","price":25.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/77.jpg?v=1771875095"},{"product_id":"361-cdi-rev-box-5-pin","title":"CDI 5 Pin Green Rev Box","description":"\u003cp\u003e5 pin CDI rev box is commonly used on 50cc-125cc Chinese made engines. These engines are most commonly used in pit bikes and Atvs.\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840963281197,"sku":"1200","price":25.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/41.jpg?v=1771875136"},{"product_id":"390-88cc-stage-1-big-bore-kit-for-honda-for-z50-xr50-crf50-xr-and-crf-50","title":"88cc stage 1 big bore kit for honda Z50, xr50 and crf50","description":"\u003cp\u003e50 Caliber Racing Stage 1 88cc Big Bore kit (52mm bore)\u003c\/p\u003e\u003cp\u003e- Fits 88-99 Z50, 2000-2020 xr and crf 50's\u003c\/p\u003e\u003cp\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- High compression 52mm piston with rings, pin, \u0026amp; clips (can still run pump gas)\u003cbr\u003e- Head gasket kit includes all gasket needed to install bore kit.\u003c\/p\u003e\u003cp\u003e- High volume oil pump is recommended\u003cbr\u003e \u003c\/p\u003e\u003cp\u003eThis is a great inexpensive way to pump up your old Honda 50 engine. This kit is recommended for those who dont want to spend a fortune but still want to see a nice power increase over the stock engine. This kit can be installed by anyone with basic mechanical skills that is not afrais to turn some nuts and bolts.\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color:#000000;font-family:Georgia, 'Times New Roman', Times, serif;\"\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color:#000000;font-family:Georgia, 'Times New Roman', Times, serif;\"\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840964559149,"sku":"4446","price":155.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10174.jpg?v=1771875153"},{"product_id":"393-88cc-race-head-big-bore-kit-for-honda-z50-xr-crf-70-xr50-and-crf-50-s","title":"88cc Race Head Big Bore Kit for honda Z50, xr crf 70, xr50, and crf 50's","description":"\u003cp\u003e88cc Race Head Big Bore Kit\u003cbr\u003e\u003cbr\u003e88cc Race head kit for Your Honda 50 or Honda 70. This kit will drastically improve your overall performance on your bike. A stock honda 50 puts around 2.2hp to the ground and this kit will put you between 5.5-6hp to the ground and 30% more to the crank! Kit comes with fully assembled race head, performance cam, 20mm carburetor, and all the other goodies needed to fulfill your need for speed!\u003cbr\u003e\u003cbr\u003eDetails:\u003cbr\u003e- Comes with fully assembled Race head (race head has larger valves for significantly increased air flow)\u003cbr\u003e- High volume oil pump included\u003cbr\u003e- Performance CDI box included that removes stock rev limiter\u003cbr\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- 52mm piston with rings, pin, \u0026amp; clips\u003cbr\u003e- Head gasket kit\u003cbr\u003e- High performance race camshaft\u003cbr\u003e- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting hardware\/wrench, air filter and lextended throttle cable\u003cbr\u003e\u003cbr\u003e\u003cstrong\u003eFits - 2000 to present CRF50, XR50, CRF70, XR70 and 88-99 Z50\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eWe have been selling these kits since 2004 and believe they are of the highest quality and put out the most power you are going to find in a Big Bore kit period.\u003cstrong\u003e \u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840964591917,"sku":"4448","price":409.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10199.jpg?v=1771875154"},{"product_id":"397-stroker-kit-1-for-honda-50-s-and-70-s","title":"108cc stroker kit 1 for honda 50's and 70's","description":"\u003cp\u003eStroker Kit #1 (upgrade your 88cc engine)\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eFits 1988 and newer Honda 50's and 70's with a 52mm bore kit.\u003c\/p\u003e\u003cp\u003eThis is a very affordable upgrade to your current 88cc engine. (ads about 2hp more over your 88cc race head kit). This kit is made specifically for the honda 50 1988 and newer engines so there will be no fitment issues and no boring of the case necessary.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThe kit includes the following parts:\u003c\/p\u003e\u003cp\u003e- 51mm Crankshaft \u003cbr\u003e- 24mm Carburetor (carb will fit 50 Caliber Intake from 88cc kits)\u003cbr\u003e- Crankcase and clutch cover gaskets\u003cbr\u003e- Head gasket kit\u003c\/p\u003e\u003cp\u003eInstallation of this kit requires the engine cases to be split. You will need a Honda manual and proper tools to complete install. We highly recommend having a professional shop install this kit. This kit does not come with installation instructions.\u003c\/p\u003e\u003cp\u003eRecommended parts to go with this kit:\u003c\/p\u003e\u003cp\u003e- High volume oil pump\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840964722989,"sku":"4448A2","price":279.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/2365.jpg?v=1771875156"},{"product_id":"398-108cc-stroker-kit-2-for-honda-50-s-and-70-s","title":"108cc stroker kit 2 for honda 50's and 70's","description":"\u003cp\u003eComplete Stroker Kit 2  (Now with 24mm Carburetor!)\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThis is hands down the biggest and baddest big bore kit we offfer for your Honda 50\/70 pitbike. 51mm crank, 52mm piston and cylinder with no boring needed. This kit puts about around 2hp more than our 88cc race head kit and will stomp any of the chinese engines out there up to 125cc. We have been selling these kits since 2004 and have had nothing but great results and happy customers!\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e The kit includes the following parts:\u003c\/p\u003e\u003cp\u003e- 51mm Crankshaft \u003cbr\u003e- High compression piston with rings, pin, \u0026amp; clips (Runs on pump gas 91 octane)\u003cbr\u003e- Race Head – Larger valves and porting for increased performance. Also has bigger cooling fins. Includes all necessary parts. Comes fully assembled\u003cbr\u003e- Lightweight aluminum cylinder with steel sleeve, cast in mounts for skid plates, and larger cooling fins.\u003cbr\u003e- High performance race camshaft \u003cbr\u003e- 24mm Carburetor kit with intake, airfilter, and throttle cable.\u003cbr\u003e- Crankcase and clutch cover gaskets\u003cbr\u003e- Head gasket kit\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eInstallation of this kit requires the engine cases to be split. You will need a Honda manual and proper tools to complete install. We highly recommend having a professional shop install this kit. This kit does not come with installation instructions.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eRecommended parts to go with this kit\u003c\/p\u003e\u003cp\u003e- High volume oil pump\u003cbr\u003e- Performance Cdi Rev box\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840964788525,"sku":"4448A3","price":534.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/286.jpg?v=1771875157"},{"product_id":"399-117cc-stroker-kit-5-for-honda-50-s-and-70-s","title":"117cc stroker kit 5 for honda 50's and 70's","description":"\u003cp\u003e117cc Stroker Kit 5\u003c\/p\u003e\u003cp\u003eThis kit is the same as the Stroker Kit 4 but also includes a 26mm carburetor for much better performance. Its an affordable kit that will convert your 88cc Race Head kit into a powerful open class 117cc engine (much more powerful than the common Chinese 107 and 125cc engines) with tons of torque! Also, this crank was made specifically for the newer engines and thus, you will not have any fitment issues like trimming the piston skirts in order to clear the crank or the piston not lining up with the cylinder deck. The kit includes the following parts:\u003c\/p\u003e\u003cp\u003e- 51mm Crankshaft with NTN bearings\u003cbr\u003e- Lightweight 54mm aluminum cylinder with steel sleeve, cast in mounts for skid plates, and larger cooling fins.\u003cbr\u003e- High compression piston with rings, pin, \u0026amp; clips\u003cbr\u003e- Crankcase and clutch cover gaskets\u003cbr\u003e- Head gasket kit\u003cbr\u003e- 26mm Performance Carb\u003cbr\u003e- Intake Kit\u003cbr\u003e- Jet kit with 10 different sizes (kit not pictured - recommend starting with a #100 or #105 with the 117 kit)\u003cbr\u003e- Throttle Cable\u003cbr\u003e- Air Filter\u003c\/p\u003e\u003cp\u003eAs with all 117cc kits on the market, installation requires engine disassembly and case boring. Therefore, we highly recommend a professional technician install this kit and the cases bored by a reputable machine shop. If you plan on installing the kit yourself, you will need to have a Clymer or Honda shop manual. Instructions do not come with the kits but the installation of the crankshaft is just like installing a stock Honda crankshaft and both manuals cover this. You should also have the following parts:\u003c\/p\u003e\u003cp\u003e- High volume oil pump\u003cbr\u003e- Oil Cooler (we do not carry these at the moment)\u003cbr\u003e- CR8HSA spark plug (not required, but recommended)\u003c\/p\u003e\u003cp\u003eNote: If you have one of our Manual Clutch kits, there has been no long term testing to see how it will hold up to the additional power with this new 117 kit. If you purchased one of our Manual Clutch Kits prior to 6\/30\/05, will recommend purchasing the Upgrade Disk Kit that is available in this section of the Catalog. Additionally, we do not recommend the use of an inner rotor kit with this clutch (on a 108cc or larger engine) as it can lead to premature clutch failure due to extra fatigue placed on the clutch housing. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on!\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840964821293,"sku":"4448A24","price":419.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/287.jpg?v=1771875159"},{"product_id":"400-117cc-stroker-kit-6-for-honda-50-s-and-70-s","title":"117cc stroker kit 6 for honda 50's and 70's","description":"\u003cp\u003e117cc Stroker Kit 6\u003c\/p\u003e\u003cp\u003eThis kit is the complete kit to convert your stock motor into a powerful open class 117cc engine (much more powerful than the common Chinese 107 and 125cc engines) with tons of torque! Also, this crank was made specifically for the newer engines and thus, you will not have any fitment issues like trimming the piston skirts in order to clear the crank or the piston not lining up with the cylinder deck. The kit includes the following parts:\u003c\/p\u003e\u003cp\u003e- 51mm Crankshaft with NTN bearings\u003cbr\u003e- Race Head – Larger valves and porting for increased performance. Also has bigger cooling fins. Includes all necessary parts. Comes disassembled.\u003cbr\u003e- High performance race camshaft\u003cbr\u003e- Lightweight 54mm aluminum cylinder with steel sleeve, cast in mounts for skid plates, and larger cooling fins.\u003cbr\u003e- High compression piston with rings, pin, \u0026amp; clips\u003cbr\u003e- Crankcase and clutch cover gaskets\u003cbr\u003e- Head gasket kit\u003cbr\u003e- 24mm Performance Carb\u003cbr\u003e- Intake Kit\u003cbr\u003e- Jet kit with 10 different sizes (kit not pictured - recommend starting with a #100 or #105 with the 117 kit)\u003cbr\u003e- Throttle Cable\u003cbr\u003e- Air Filter\u003c\/p\u003e\u003cp\u003eAs with all 117cc kits on the market, installation requires engine disassembly and case boring. Therefore, we highly recommend a professional technician install this kit and the cases bored by a reputable machine shop. If you plan on installing the kit yourself, you will need to have a Clymer or Honda shop manual. Instructions do not come with the kits but the installation of the crankshaft is just like installing a stock Honda crankshaft and both manuals cover this. You should also have the following parts:\u003c\/p\u003e\u003cp\u003e- High volume oil pump\u003cbr\u003e- Oil Cooler (we do not carry these at the moment)\u003cbr\u003e- CR8HSA spark plug (not required, but recommended)\u003c\/p\u003e\u003cp\u003eNote: If you have one of our Manual Clutch kits, there has been no long term testing to see how it will hold up to the additional power with this new 117 kit. If you purchased one of our Manual Clutch Kits prior to 6\/30\/05, will recommend purchasing the Upgrade Disk Kit that is available in this section of the Catalog. Additionally, we do not recommend the use of an inner rotor kit with this clutch (on a 108cc or larger engine) as it can lead to premature clutch failure due to extra fatigue placed on the clutch housing. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on!\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840964886829,"sku":"4448A25","price":569.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/288.jpg?v=1771875160"},{"product_id":"404-left-and-right-case-gaskets-for-honda-50","title":"Left and right case gaskets for Honda 50","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #000000;\"\u003eLeft and right case gaskets for Honda 50, Fits all 1992 to current year X50, XR50, and CRF50\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840965312813,"sku":"5405","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/292.jpg?v=1771875163"},{"product_id":"405-head-gasket-and-clutch-gasket-kit-for-chinese-lifan-engines","title":"47mm Head gasket and clutch gasket kit for Chinese Lifan engines.","description":"\u003cp\u003e47mm 70cc Head gasket and clutch gasket kit for Honda 50 and Chinese Lifan motor. All gaskets shown are included in this kit.\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840965411117,"sku":"5400","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/293.jpg?v=1771875164"},{"product_id":"414-high-volume-oil-pump-vintage-honda-69-81-z50","title":"High Volume Oil Pump - Vintage Honda 69-81 Z50","description":"\u003cp\u003e\u003cstrong\u003eHigh Volume Oil Pump - Vintage Honda Z50 \u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003eHigh volume oil pump for vintage Honda pit bikes and small ATVs. Delivers up to 3x the volume as the stock pump. We highly recommend upgrading your oil system when installing a big bore kit. Installation requires 2mm drill out of oiling outlet. \u003cbr\u003e\u003cbr\u003e Fits\u003cbr\u003e - Z50 (1969-1981)\u003cbr\u003e - CT70 (Up to 1981)\u003cbr\u003e - SL70 (Up to 1981)\u003cbr\u003e - XL70 (Up to 1981)\u003cbr\u003e - ATC70 (Up to 1981)\u003cbr\u003e - TRX70 (Up to 1981)\u003cbr\u003e\u003cbr\u003e ** Note - Installation requires 2mm drill out of oiling outlet.\u003c\/p\u003e","brand":"Honda Trail Bikes","offers":[{"title":"Default Title","offer_id":51840966197549,"sku":"5122","price":32.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/7310.jpg?v=1771875170"},{"product_id":"417-high-volume-oil-pump-xr50-crf50-82-present","title":"High volume oil pump XR50 CRF50 82-Present","description":"\u003cp\u003eHigh Volume oil pump for 1992 to current year Honda xr and crf 50.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cul\u003e\n\u003cli\u003eFits the following: \u003c\/li\u003e\n\u003cli\u003e\n\u003c\/li\u003e\n\u003cli\u003eHonda Z50 - 1982 and Newer\u003c\/li\u003e\n\u003cli\u003eHonda CT70 - 1982 and Newer\u003c\/li\u003e\n\u003cli\u003eHonda XR50 - All Years\u003c\/li\u003e\n\u003cli\u003eHonda CRF50 - All Years\u003c\/li\u003e\n\u003cli\u003eHonda XR70 - All Years\u003c\/li\u003e\n\u003cli\u003eHonda CRF70 - All Years\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp\u003e\u003cbr\u003eHighly recommended when using a big bore kit\u003cbr\u003e\u003cbr\u003eRequires 2mm drill out of oiling outlet\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840966426925,"sku":"5121","price":26.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/2259.jpg?v=1771875172"},{"product_id":"531-54mm-head-gasket-kit","title":"54mm Head gasket kit","description":"\u003cp\u003e\u003cstrong\u003e54mm (117cc) Head gasket kit. This is a complete top end gasket kit that also includes exhaust gasket. \u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840973668653,"sku":"5401","price":16.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/529.jpg?v=1771875252"},{"product_id":"532-52mm-88cc-110cc-125cc-head-gasket-and-clutch-gasket-kit-for-chinese-lifan-engines","title":"52mm 88cc 110cc 125cc Head gasket and clutch gasket kit for Chinese Lifan engines.","description":"\u003cp\u003e52mm 88cc 110cc 125cc Head gasket and clutch gasket kit for Honda 50 and Chinese Lifan motor. All gaskets shown are included in this kit.\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840973701421,"sku":"5404","price":18.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/530.jpg?v=1771875253"},{"product_id":"573-honda-50-70-high-performance-carburetor-and-intake-kit","title":"Honda 50\/70 High Performance Carburetor and Intake Kit","description":"\u003cp\u003eHigh Performance 20mm Carburetor and Intake Kit for 50cc\/70cc Honda 50\/70. This carburetor can also be used on many other applications. Pitbikes, 70cc-125cc for example.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eComes with - 20mm High Performance Carburetor, High Performance Intake, Throttle cable, and HP Air Filter\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eFits - Honda Z50, XR50, CRF50, XR70, CRF70, CT70, SL70, XL70, ATV70, TRX70, ATC70\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840975634733,"sku":"4448A13","price":105.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/907.jpg?v=1771875280"},{"product_id":"578-88cc-stage-1-big-bore-kit-for-honda-for-z50-xr50-crf50-xr-and-crf-50","title":"88cc stage 1 big bore kit for honda for xr and crf 70","description":"\u003cp\u003eHonda 70 Stage 1 88cc Big Bore kit (52mm bore)\u003c\/p\u003e\u003cp\u003e- Fits all xr and crf 70's\u003c\/p\u003e\u003cp\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- High compression 52mm piston with rings, pin, \u0026amp; clips (can still run pump gas)\u003cbr\u003e- Head gasket kit includes all gasket needed to install bore kit.\u003c\/p\u003e\u003cp\u003e- High volume oil pump is recommended\u003cbr\u003e \u003c\/p\u003e\u003cp\u003eThis is a great inexpensive way to pump up your Honda 70 engine. This kit is recommended for those who dont want to spend a fortune but still want to see a nice power increase over the stock engine. This kit can be installed by anyone with basic mechanical skills that is not afrais to turn some nuts and bolts.\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color:#000000;font-family:Georgia, 'Times New Roman', Times, serif;\"\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e\u003cp\u003e\u003cspan style=\"color:#000000;font-family:Georgia, 'Times New Roman', Times, serif;\"\u003e\u003cstrong\u003e \u003c\/strong\u003e\u003c\/span\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840975733037,"sku":"4446A1","price":155.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10212.jpg?v=1771875282"},{"product_id":"579-88cc-stage-2-big-bore-kit-for-honda-xr70-and-crf-70","title":"88cc stage 2 big bore kit for honda xr70 and crf 70","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eStage 2 88cc Big Bore kit for Honda xr70 and crf70 all years\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- High compression 52mm piston with rings, pin, \u0026amp; clips (you can still run pump gas)\u003cbr\u003e- Head gasket kit, all gasket included needed for install.\u003cbr\u003e- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting hardware\/wrench, air filter, and long throttle cable\u003cbr\u003e- Performance camshaft\u003c\/p\u003e\u003cp\u003e- High volume oil pump is recommended\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThis is a great kit to pump up your Honda 70. This kit deliveres about 2 times the horse power as the stock motor.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eInstallation Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit. (requires cylinder removal).\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840975995181,"sku":"4447A1","price":279.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/10299.jpg?v=1771875283"},{"product_id":"642-yamaha-pw50-top-end-kit","title":"Yamaha PW50 Top End Kit","description":"\u003cp\u003eYamaha PW50 Cylinder Kit\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThis is a stock spec replacement kit from 50 Caliber Racing that includes everything needed to rebuild your top end. These kits are very high quality and will last for years under normal use. \u003cbr\u003e\u003cbr\u003eFits Years - 1981 - 2009\u003cbr\u003e\u003cbr\u003eKit Includes\u003cbr\u003e1 - Cylinder Block\u003cbr\u003e1 - Piston\u003cbr\u003e2 - Piston Rings\u003cbr\u003e2 - Clips\u003cbr\u003e1 - Piston Pin\u003cbr\u003e1 - Head Gasket\u003cbr\u003e1 - Base Gasket\u003cbr\u003e1 - Pin Bearing\u003cbr\u003e4 - Cylinder Studs\u003cbr\u003e4 - Stud Nut\u003cbr\u003e1 - Spark Plug\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003ePW 50 Top end rebuild Kit\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840980058413,"sku":"4449A","price":59.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/9815.jpg?v=1771875330"},{"product_id":"657-yamaha-pw50-big-bore-60cc-top-end-kit","title":"Yamaha PW50 Big Bore 60cc Top End Kit","description":"\u003cp\u003e\u003cstrong\u003eYamaha PW50 60cc Big Bore Kit 1979-2009 (top end cylinder kit)\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e Bolt on 60cc Big Bore Kit for Yamaha PW50 an QT50 Pit Bikes. Ready to install out of the box, includes all gaskets and components necessary to rebuild your top end. Our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. This kit can be installed by anyone with basic mechanical skills that is not afraid to turn some nuts and bolts. Breathe new life into your bike with our high quality, affordable and reliable big bore kit!\u003cbr\u003e\u003cbr\u003e Kit Includes:\u003cbr\u003e\u003cbr\u003e 1 - Cylinder\u003cbr\u003e 1 - Piston\u003cbr\u003e 2 - Piston Rings\u003cbr\u003e 2 - Circlips\u003cbr\u003e 1 - Piston Pin\u003cbr\u003e 1 - Head Gasket\u003cbr\u003e 1 - Base Gasket\u003cbr\u003e 1 - Pin Bearing\u003cbr\u003e 4 - Cylinder Studs\u003cbr\u003e 4 - Stud Nuts\u003cbr\u003e 1 - Spark Plug\u003cbr\u003e\u003cbr\u003e Fits the following Yamaha models:\u003cbr\u003e\u003cbr\u003e PW50 Y-Zinger (1981 - 2009)\u003cbr\u003e QT50 Yamahopper (1979 - 1987)\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840980648237,"sku":"4449B","price":79.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/2490.jpg?v=1771875336"},{"product_id":"658-yamaha-pw80-top-end-rebuild-kit","title":"Yamaha PW80 Top End Rebuild Kit","description":"\u003cp\u003eYamaha PW80 Top end rebuild Kit\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThis is a stock spec replacement kit from 50 Caliber Racing that includes everything needed to rebuild your top end. These kits are very high quality and will last for years under normal use. \u003cbr\u003e\u003cbr\u003eFits Years - 1983-2006\u003cbr\u003e\u003cbr\u003eKit Includes\u003cbr\u003e1 - Cylinder Block\u003c\/p\u003e\u003cp\u003e1 - Cylinder head\u003cbr\u003e1 - Piston\u003cbr\u003e2 - Piston Rings\u003cbr\u003e2 - Clips\u003cbr\u003e1 - Piston Pin\u003cbr\u003e1 - Head Gasket\u003cbr\u003e1 - Base Gasket\u003cbr\u003e1 - Pin Bearing\u003cbr\u003e4 - Cylinder Studs\u003cbr\u003e4 - Stud Nut\u003cbr\u003e1 - Spark Plug\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003ePW 80 Top End rebuild Kit\u003cbr\u003e\u003cbr\u003e\u003cbr\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840980681005,"sku":"4449C","price":89.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/1331.jpg?v=1771875338"},{"product_id":"744-polaris-sportsman-90-top-end-cylinder-kit","title":"Polaris Sportsman 90 Top End Cylinder Kit","description":"\u003cp\u003ePolaris Sportsman 90 top end rebuild kit 2001-2006\u003cbr\u003e\u003cbr\u003e Fits:\u003cbr\u003e Polaris Scrambler 90 (01-03)\u003cbr\u003e Polaris Predator 90 (03-06)\u003cbr\u003e Polaris Sportsman 90 (01-06)\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e50 Caliber Racing stock replacement kit. Includes all gaskets and components necessary to rebuild your top end. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. Nothing will beat the look on your kid's face when you bring their bike back to from the dead!\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eKit Contents:\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e1 - Cylinder\u003cbr\u003e1 - Piston\u003cbr\u003e2 - Piston Rings\u003cbr\u003e2 - Clips\u003cbr\u003e1 - Wrist Pin\u003cbr\u003e1 - Head Gasket\u003cbr\u003e1 - Base Gasket\u003cbr\u003e1 - Spark Plug\u003cbr\u003e1 - Fuel Filter\u003cbr\u003e1 - Air Filter\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eReplaces Polaris part # 0450007\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840984023341,"sku":"4449A3","price":89.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/1837.jpg?v=1771875371"},{"product_id":"749-piston-kit-standard-bore-ktm-50","title":"Piston Kit Standard Bore KTM 50","description":"\u003cp\u003ePiston Kit with Standard Bore for KTM 50cc Pit Bikes. Stock bore size and compression ratio. Why spend all your hard earned money at the KTM dealer paying inflated prices, when you can buy high quality, OEM spec replacement parts from us and have tons of cash left over! We offer a warranty and we stand by our products. \u003cbr\u003e\u003cbr\u003eWill fit all KTM 50cc bikes from 2002 to current:\u003cbr\u003e\u003cbr\u003eSX\u003cbr\u003eSX MINI\u003cbr\u003eSX Junior\u003cbr\u003eSX Junior Adventure\u003cbr\u003eSX Senior Adventure\u003cbr\u003eSX Pro Junior LC\u003cbr\u003eSX Pro Senior LC\u003cbr\u003e\u003cbr\u003e*NOTE- Will NOT fit 2001 and older KTM50 with black Morini Franco engine.\u003c\/p\u003e\u003cp\u003e\u003cbr\u003e Kit Contents: \u003cbr\u003e\u003cbr\u003e 1 - Piston\u003cbr\u003e 2 - Piston Rings\u003cbr\u003e 2 - Clips\u003cbr\u003e 1 - Wrist Pin\u003cbr\u003e 1 - Bearing\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840984449325,"sku":"4457A1","price":29.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/1859.jpg?v=1771875376"},{"product_id":"836-ktm-50-top-end-cylinder-kit","title":"KTM 50 Water Cooled Top End Cylinder Kit 2002-2008","description":"\u003cp\u003e\u003cstrong\u003eKTM 50 Water Cooled Top End Cylinder Kit  2002-2008\u003c\/strong\u003e\u003cbr\u003e\u003cspan style=\"color: #ff0000;\"\u003e\u003cstrong\u003eDISCONTINUED\u003c\/strong\u003e\u003c\/span\u003e\u003cbr\u003e 50 Caliber Racing stock replacement kit. Includes all gaskets and components necessary to rebuild the top end on your water cooled KTM 50. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. You can save big money and gain a huge sense of satisfaction when you do your own top end rebuild. With our kits you don't have to worry about modifying parts or missing items. Just bolt it together and go!\u003cbr\u003e\u003cbr\u003e Kit Includes:\u003cbr\u003e\u003cbr\u003e 1 - Cylinder\u003cbr\u003e 1 - Piston\u003cbr\u003e 1 - Piston Ring Kit\u003cbr\u003e 2 - Circlips\u003cbr\u003e 1 - Wrist Pin\u003cbr\u003e 1 - Wrist Pin Needle Bearing\u003cbr\u003e 1 - Gasket Set\u003cbr\u003e 1 -  O-ring Set\u003cbr\u003e\u003cbr\u003e Will fit all KTM 50cc water cooled bikes from 2002 to 2008:\u003cbr\u003e\u003cbr\u003eSX\u003cbr\u003eSX MINI\u003cbr\u003eSX Junior\u003cbr\u003eSX Pro Junior LC\u003cbr\u003eSX Pro Senior LC\u003cbr\u003e\u003cbr\u003e*NOTE- Will NOT fit 2001 and older KTM50 with black Morini Franco engine. Will not work with air cooled engines (KTM Adventure)\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840990216493,"sku":"4449A10","price":119.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/2505.jpg?v=1771875443"},{"product_id":"838-yamaha-pw50-big-bore-kit-60cc-with-head","title":"Yamaha PW50 Big Bore Kit 60cc With Head","description":"\u003cp\u003e\u003cstrong\u003eYamaha PW50 60cc Big Bore Kit 1979-2009 (top end cylinder kit with head included)\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e Bolt on 60cc Big Bore Kit for Yamaha PW50 and QT50 Pit Bikes. Ready to install out of the box, includes all gaskets and components necessary to rebuild your top end. Our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. This kit can be installed by anyone with basic mechanical skills that is not afraid to turn some nuts and bolts. Breathe new life into your bike with our high quality, affordable and reliable big bore kit!\u003cbr\u003e\u003cbr\u003e Kit Includes:\u003cbr\u003e\u003cbr\u003e 1 - Cylinder\u003cbr\u003e1 - Cylinder Head\u003cbr\u003e1 - Piston\u003cbr\u003e2 - Piston Rings\u003cbr\u003e2 - Circlips\u003cbr\u003e1 - Piston Pin\u003cbr\u003e1 - Head Gasket\u003cbr\u003e1 - Base Gasket\u003cbr\u003e1 - Pin Bearing\u003cbr\u003e4 - Cylinder Studs\u003cbr\u003e4 - Stud Nuts\u003cbr\u003e1 - Spark Plug\u003cbr\u003e\u003cbr\u003e Fits the following Yamaha models:\u003cbr\u003e\u003cbr\u003e PW50 Y-Zinger (1981 - 2009)\u003cbr\u003e QT50 Yamahopper (1979 - 1987)\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840990282029,"sku":"4449B1","price":89.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/2489.jpg?v=1771875445"},{"product_id":"898-ktm-50-top-end-cylinder-kit","title":"KTM 50 Air Cooled Top End Cylinder Kit 2002-2008","description":"\u003cp\u003e\u003cstrong\u003eKTM 50 AIr Cooled Top End Cylinder Kit 2002 - 2008\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e 50 Caliber Racing stock replacement kit. Includes all gaskets and components necessary to rebuild the top end on your air cooled KTM 50. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. You can save big money and gain a huge sense of satisfaction when you do your own top end rebuild. With our kits you don't have to worry about modifying parts or missing items. Just bolt it together and go!\u003cbr\u003e\u003cbr\u003e Kit Includes:\u003cbr\u003e\u003cbr\u003e 1 - Cylinder\u003c\/p\u003e\u003cp\u003e1 - Cylinder Head\u003cbr\u003e 1 - Piston\u003cbr\u003e 1 - Piston Ring\u003cbr\u003e 2 - Circlips\u003cbr\u003e 1 - Wrist Pin\u003cbr\u003e 1 - Wrist Pin Needle Bearing\u003cbr\u003e 1 - Gasket Set\u003cbr\u003e\u003cbr\u003eFits KTM 50cc air cooled bikes from 2002 to 2008:\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eSX Mini Junior Adventure\u003c\/p\u003e\u003cp\u003eSX Mini Senior Adventure\u003c\/p\u003e\u003cp\u003eSX Mini AC\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003e*NOTE- Will NOT fit 2001 and older KTM50 with black Morini Franco engine. Will not work with water cooled engines.\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51840993296685,"sku":"4449A11","price":109.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/2886.jpg?v=1771875476"},{"product_id":"1016-yamaha-ttr-125-top-end-cylinder-kit","title":"Yamaha TTR 125 Top End Cylinder Kit","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan style=\"color: #ff0000;\"\u003eDISCONTINUED\u003c\/span\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eYamaha TTR 125 Top End Cylinder Kit\u003c\/strong\u003e\u003cbr\u003e50 Caliber Racing Cylinder kit. Includes all gaskets and components necessary to rebuild your top end. Manufactured to OEM spec, our kits are complete, high quality and will extend the life of your toys for many more years of enjoyment. You can save big money and gain a huge sense of satisfaction when you do your own top end rebuild. With our kits you don't have to worry about modifying parts or missing items. Just bolt it together and go!\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eKit Includes:\u003c\/strong\u003e\u003cbr\u003e1 - Cylinder\u003cbr\u003e1 - Piston\u003cbr\u003e1 - Piston Ring Kit\u003cbr\u003e2 - Circlips\u003cbr\u003e1 - Wrist Pin\u003cbr\u003e1 - Base Gasket\u003cbr\u003e1 - Head Gasket\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFits the following Yamaha models:\u003c\/strong\u003e\u003cbr\u003eYamaha TTR125 (2000-2005)\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51841001062701,"sku":"4449A16","price":60.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/5170.jpg?v=1771875539"},{"product_id":"1202-honda-z50-performance-camshaft-1968-1981","title":"Honda Z50 Performance Camshaft 1968-1981","description":"\u003cp\u003e\u003cstrong\u003eThis is a much more agressive camshaft than stock. This can be added to your stock motor for increased Horse Power performance. Cam will work with a bone stock or upgraded 88cc engine with a stock Cylinder Head. \u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003e\u003cbr\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eFits 1968-1981 Honda Z50\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eALL ATC 70'S\u003cbr\u003eALL TRX 70'S\u003cbr\u003eALL XL\/CL\/SL70'S\u003c\/strong\u003e\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51841005846829,"sku":"5640","price":60.0,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/9199.jpg?v=1771875593"},{"product_id":"1253-honda-ct70-atc70-standard-bore-47mm-piston-kit","title":"Honda CT70 ATC70 Standard Bore 47mm Piston Kit","description":"\u003cp\u003e\u003cstrong\u003e50 Caliber Racing 47mm Standard Bore Piston Kit for Honda C70 CT70 CL70 SL70 XL70 ATC70\u003c\/strong\u003e\u003cbr\u003e\u003cbr\u003e Piston Kit with Standard Bore for Honda 70cc vintage pit bikes. Complete assembly including 47mm piston, wrist pin, rings and circlips. Replaces oem Honda part number 13101-087-000. Our kits are high quality, complete and ready to build right out of the box. You'll be able to take confidence that you'll have the precision components you need to get your toys running again, the right way. Be a superdad and fix your kid's bike!\u003cbr\u003e\u003cbr\u003e \u003cstrong\u003eSpecifications:\u003c\/strong\u003e\u003cbr\u003e - Includes 47mm piston, rings, wrist pin, \u0026amp; circlips\u003cbr\u003e - Standard bore size and compression\u003cbr\u003e - Replaces OEM part # 13101-087-000\u003cbr\u003e - Manufactured to OEM Spec\u003cbr\u003e - Please note gray rings go on top!\u003cbr\u003e\u003cbr\u003e \u003cstrong\u003eFits the following Honda Models:\u003c\/strong\u003e\u003cbr\u003e - C70 (1970-1983)\u003cbr\u003e - CL70 (1969-1973)\u003cbr\u003e - CT70 (1969-1982)\u003cbr\u003e - SL70 (1971-1973)\u003cbr\u003e - XL70 (1976)\u003cbr\u003e - ATC70 (1978-1985)\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51841008501037,"sku":"4448A26","price":45.99,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/9861.jpg?v=1771875612"},{"product_id":"1332-88cc-stage-2-big-bore-kit-for-honda-xr750-and-crf-50","title":"88cc stage 2 big bore kit for honda xr750 and crf 50","description":"\u003cp\u003e\u003cstrong\u003e\u003cspan\u003eStage 2 88cc Big Bore kit for Honda xr50 and crf50 88-up\u003cbr\u003e\u003c\/span\u003e\u003c\/strong\u003e\u003c\/p\u003e\u003cp\u003e- Lightweight aluminum cylinder with steel sleeve\u003cbr\u003e- Cast in mounts on cylinder for aftermarket skid plates\u003cbr\u003e- Oversized cooling fins on cylinder for efficient heat dissipation\u003cbr\u003e- High compression 52mm piston with rings, pin, \u0026amp; clips (you can still run pump gas)\u003cbr\u003e- Head gasket kit, all gasket included needed for install.\u003cbr\u003e- 20mm Performance carb assembly. Includes: 20mm carb, intake, heatstop, gaskets, mounting hardware\/wrench, air filter, and long throttle cable\u003cbr\u003e- Performance camshaft\u003c\/p\u003e\u003cp\u003e- High volume oil pump is recommended\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eThis is a great kit to pump up your Honda 70. This kit deliveres about 2 times the horse power as the stock motor.\u003c\/p\u003e\u003cp\u003e \u003c\/p\u003e\u003cp\u003eInstallation Note: It will save a lot of time and effort if the oil pump is installed while installing the bore kit. (requires cylinder removal).\u003c\/p\u003e","brand":"50 Caliber Racing","offers":[{"title":"Default Title","offer_id":51841010794797,"sku":"4447","price":269.99,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/files\/11596.jpg?v=1771875641"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0941\/9040\/3885\/collections\/big-bore-kits.jpg?v=1772531065","url":"https:\/\/50caliberracing.com\/collections\/big-bore-kits.oembed?page=2","provider":"50 Caliber Racing","version":"1.0","type":"link"}