Big Bore Kits

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  • 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 stage 1 big bore kit for honda for xr and crf 70

    Price $155.00

    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 pump gas)
    - Head gasket kit includes all gasket needed to install bore kit.

  • 88cc stage 2 big bore kit for honda xr70 and crf 70

    Price $279.99

    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 rings, pin, & clips (you can still run pump gas)
    - Head gasket kit

    • Out-of-Stock

    117cc stroker kit 5 for honda 50's and 70's

    Price $419.00

    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!

  • Honda TRX XR400R 440cc Big Bore Kit

    Price $129.99

    440cc Big Bore Kit with 89mm Piston for Honda XR400R / TRX400EX 1996- 2016

    Bolt on 89mm 440cc Big Bore Kit for all Honda TRX400ex and XR400 models. This is a complete kit, with everything you need to rebuild your top end.

  • Rear Brake Caliper for Honda Sportrax

    Price $59.99

    Brand new with 1 Year Warranty, 50 Caliber Racing single 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 included so you're required to use your current caliper mounting brackets with this Caliper.

  • Front Brake Caliper Yamaha Rhino 450 660

    Price $69.99

    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 for Part numbers: 5B4-2580T-01-00 and 5B4-2580U-01-00.

  • Rear Brake Caliper Yamaha Rhino 700

    Price $89.99

    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 for Part numbers: 5B4-2580V-00-00 and 5B4-2580W-00-00.

  • Honda CT70 ATC70 Standard Bore 47mm Piston Kit

    Price $45.99

    50 Caliber Racing 47mm Standard Bore Piston Kit for Honda C70 CT70 CL70 SL70 XL70 ATC70 vintage pit bikes. Complete assembly including 47mm piston, wrist pin, rings and circlips. Replaces oem Honda part number 13101-087-000.