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  • Model: 68-81 ct70
  • Model: 69-81 z50
  • Model: 68-81 ct70
  • Model: 88-91 z50
  • 88cc stage 1 Vintage big bore kit for honda z50, ct70, atc70, trx70, sl70, xl70

    88cc stage 1 Vintage big bore kit for honda z50,...

    Price $155.00

    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 kit includes all gasket needed to install bore kit.
  • 88cc Race Head Vintage big bore kit for honda z50 and ct70

    88cc Race Head Vintage big bore kit for honda z50...

    Price $409.99

    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 and is comparable in power to the much larger Chinese 124cc engines!
  • 88cc stage 2 Vintage big bore kit for honda z50, ct70, atc70, trx70, sl70, xl70

    88cc stage 2 Vintage big bore kit for honda z50,...

    Price $244.99

    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