Big Bore Kits
There are 36 products.

Big Bore Kits

Big Bore kits for all makes of the Honda 50, xr, crf, z, z50, xr50, and crf50. Also manual clutch kits, high...More

Big 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!

  • 88cc stage 1 big bore kit for honda z50, ct70, xr70, xr50, and crf 50's
    Available

    88cc stage 1 big bore kit for honda for...

    Stage 1 88cc Big Bore kit for 92-99 Z50, 2000-present xr and crf 50's - Lightweight aluminum cylinder with steel sleeve- Cast in mounts on cylinder for aftermarket skid plates- Oversized cooling fins on cylinder for efficient heat dissipation- High compression 52mm piston with rings, pin, & clips (can still run...
    $129.00

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  • 88cc stage 2 big bore kit for honda xr crf 50's and 70's
    Available

    88cc stage 2 big bore kit for honda Z, XR,...

    Stage 2 88cc Big Bore kit for 92-99 Z50 and 2000-present xr and crf 50 - 20mm Carburetor kit - Performance camshaft- Lightweight aluminum cylinder with steel sleeve- Cast in mounts on cylinder for aftermarket skid plates- Oversized cooling fins on cylinder for efficient heat dissipation- High compression 52mm...
    $229.00

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  • 88cc stage 2 Vintage big bore kit for honda z50 and ct70
    Available

    88cc stage 2 Vintage big bore kit for...

    Vintage Stage 2 88cc Big Bore kit - Fits 1968-1981 honda z50, ct70, atc70, trx70, sl70, xl70 - 20mm Carburetor - 52mm Piston and cylinder - Lightweight aluminum cylinder with steel sleeve- Cast in mounts on cylinder for aftermarket skid plates- Oversized cooling fins on cylinder for efficient heat dissipation
    $199.00

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  • 88cc Race Head Big Bore Kit for honda Z50, xr crf 70, xr50, and crf 50's
    Available

    88cc Race Head Big Bore Kit for honda Z50,...

    88cc 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,...
    $349.00

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  • 88cc Race Head Vintage big bore kit for honda z50 and ct70
    Available

    88cc Race Head Vintage big bore kit for...

    50 Caliber Racing Race Head, 88cc Big Bore kit, and 20mm Carburetor Our 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...
    $359.00

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  • 108cc stroker kit 1 for honda 50's and 70's
    Available

    108cc stroker kit 1 for honda 50's...

    Stroker Kit 1 Ready for more power? Convert your 88cc Race Head kit into a 108cc stroked out beast!! (Much more powerful than any of the chinese engines up to 125cc)
    $229.99

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    108cc stroker kit 2 for honda 50's...

    Complete 108cc Stroker kit for Honda crf and xr 50 and 70cc engines 1988 to current. Kit includes piston, race head, cylinder, cam, carburetor, throttle cable, gaskets, intake, crank, and filter.
    $499.00

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    Trail Bikes HD Auto Clutch

    Honda Trail Bikes Heavy Duty Auto Clutch kit. This clutch is a great improvement to your stock clutch. We recommend this kit with any upgraded/big bore motor. The stock clutch is designed for a stock motor and that's that. If you want reliablilty and power this is a must have performance upgrade. Fits 1992 to...
    $85.00

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    52mm Head gasket kit

    52mm (88cc -108cc) and 54mm (117cc) Head gasket kit
    $12.00

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    Left and right case gaskets for Honda 50

    Left and right case gaskets for Honda 50, also fits all 50-125cc honda clone chinese engines.
    $12.00

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    47mm Head gasket and clutch gasket kit for...

    47mm 70cc Head gasket and clutch gasket kit for Honda 50 and Chinese Lifan motor.
    $18.00

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    Head gaskets 47mm and 52mm for Lifan Engines,

    47mm or 52m head gasket kit
    $11.00

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    Performance Intake

    Performance Intake for stock head or race head
    $32.00

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    k1-1978 Vintage High volume oil pump

    k1-1978 Vintage High volume oil pump
    $32.00

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    1979-81 z50 Vintage High volume oil pump

    Deliveres 3 times the amount of oil over stock pump
    $32.00

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    82-Present High volume oil pump

    Delivers 3 times the amount of oil over stock pump.
    $26.00

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  • Available

    XR CRF High volume oil pump

    Fits all years of xr and crf, Delivers 3 times the amount of oil over stock pump.
    $26.00

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  • Available

    Fits 150/160cc YX/GPX Engine's

    150/160cc YX/GPX Race Head V2 Upgrade Kit: - Race Head V2 - Roller rockers, 30mm intake valve, 24.5mm exhaust valve, 27mm intake port, 23mm exhaust port. (valves installed)
    $359.00

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    Honda xr crf 50 rev box

    50 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
    $25.00

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  • Available

    CDI 5 Pin Green Rev Box

    5 Pin CDI rev box
    $25.00

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    Gasket kit complete 52mm 110cc - 125cc

    50 Caliber Racing 52mm Gasket kit for 110cc and 125cc Lifan Engines Pit Bikes Atv Pocket Bike Go Karts and Mini Choppers
    $15.00

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    Gasket Head 47mm 70cc

    50 Caliber Racing 47mm Head Gasket Kit for 70cc Pit Bikes Atv Pocket Bike Go Karts and Mini Choppers
    $10.00

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    Gasket Head 52mm 110cc-125cc

    50 Caliber Racing 52mm Head Gasket Kit for 110cc and 125cc Pit Bikes Atv Pocket Bike Go Karts and Mini Choppers
    On sale! $10.00

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    Gasket kit Complete 47mm 70cc

    50 Caliber Racing 47mm Gasket kit for 70cc Lifan Engines Pit Bikes Atv Pocket Bike Go Karts and Mini Choppers
    $15.00

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  • Available

    54mm Head gasket kit

    54mm (117cc) Head gasket kit
    $12.00

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    52mm 88cc 110cc 125cc Head gasket and...

    52mm 88cc 110cc 125cc Head gasket and clutch gasket kit for Honda 50 and Chinese Lifan motor.
    $18.00

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    88cc stage 1 Vintage big bore kit for...

    Vintage Stage 1 88cc Big Bore kit (52mm bore)- Lightweight aluminum cylinder with steel sleeve- Cast in mounts on cylinder for aftermarket skid plates- Oversized cooling fins on cylinder for efficient heat dissipation- High compression 52mm piston with rings, pin, & clips (can still run pump gas)- Head gasket...
    $129.00

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  • 88cc stage 1 big bore kit for honda z50, ct70, xr70, xr50, and crf 50's
    Available

    88cc stage 1 big bore kit for honda for xr...

    Stage 1 88cc Big Bore kit for Honda xr and crf 70's. Fits all years - Lightweight aluminum cylinder with steel sleeve- Cast in mounts on cylinder for aftermarket skid plates- Oversized cooling fins on cylinder for efficient heat dissipation- High compression 52mm piston with rings, pin, & clips (can still run...
    $129.00

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  • 88cc stage 2 big bore kit for honda xr crf 50's and 70's
    Available

    88cc stage 2 big bore kit for honda xr70...

    Stage 2 88cc Big Bore kit for Honda xr70 and crf70 all years - 20mm Carburetor kit - Performance camshaft- Lightweight aluminum cylinder with steel sleeve- Cast in mounts on cylinder for aftermarket skid plates- Oversized cooling fins on cylinder for efficient heat dissipation- High compression 52mm piston with...
    $229.00

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  • 20mm Carburetor for Honda 50 Big bore engine 4208
    Available

    Honda 50/70 High Performance Carburetor...

    High Performance 20mm Carburetor and Intake Kit for 50cc/70cc Honda 50/70. This carb should be used on big bore engines, 88cc-125cc.
    $105.00

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  • Available

    117cc stroker kit 6 for honda 50's...

    This kit is the complete kit to convert your stock motor into a powerful open class 117cc engine!
    $549.00

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    117cc stroker kit 5 for honda 50's...

    This kit is the same as the Stroker Kit 4 but also includes a 26mm carburetor for much better performance. This is 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!
    $399.00

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  • Honda TRX400EX 440cc Big Bore Kit
    Available

    Honda TRX XR 400 440cc Big Bore Kit

    Honda XR400 / TRX400EX 89mm 440cc Big Bore Kit 1996- 2016 Bolt on 89mm 440cc Big Bore Kit for all Honda TRX400 and XR400 models. This is a complete kit, with everything you need to rebuild your top end.
    $319.99

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  • Rear Brake Caliper for Honda Sportrax
    Available

    Rear Brake Caliper for Honda Sportrax

    Brand new with 1 Year Warranty, 50 Caliber Racing dual piston Rear Brake Caliper assembly for your Honda ATV. Includes billet parking brake block off plate which is removeable in order to maintain the use of your existing parking brake. Comes with new Pads plus assembly hardware shown, however the bracket is not...
    $59.99

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  • Front Brake Caliper Yamaha Rhino
    Available

    Front Brake Caliper Yamaha Rhino 450 660

    Brand new with 1 Year Warranty, 50 Caliber Racing Front Brake Caliper assembly for the Yamaha Rhino 450/660 UTV. Select to purchase Left, Right or both as a pair to replace the factory Brake Caliper for your Rhino. They come fully assembled including Pads with mounting bracket as a complete and direct replacement...
    $69.99

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  • Rear Brake Caliper Yamaha Rhino 700
    Available

    Rear Brake Caliper Yamaha Rhino 700

    Brand new with 1 Year Warranty, 50 Caliber Racing Rear Brake Caliper assembly for the Yamaha Rhino YXR 700. Select to purchase Left, Right or both as a pair to replace the factory Rear Brake Caliper for your Rhino. They come fully assembled including Pads with mounting bracket as a complete and direct replacement...
    $89.99

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