Top End Rebuild Kits

Complete 50 Caliber Racing top end rebuild kit for your Honda TRX400EX / TRX400X / XR400R! 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.

Piston Kit with Standard Bore for KTM 50cc Pit Bikes, 2002-2008. Complete assembly including piston, wrist pin, needle bearing, rings and clips. 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!

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.

This kit from 50 Caliber Racing is to upgrade the cylinder head on stock YX/GPX 150 or 160 engines to our new Race Head V2. The addition of this new head will dramatically increase the performance of your stock engine! The addition of roller rocker arms and a new camshaft are the biggest changes followed by bigger valves and ports. The exhaust valve is now stainless as well (21-4N material). This all adds up to a cylinder head that puts out a professional level of performance yet is still affordable for the privateer rider.

50 Caliber Racing 60cc Big Bore Top End Kit with Head included for Yamaha PW50 & QT50 Pit Bikes. This is a complete bolt on top end cylinder kit including head, ready to install out of the box. Includes a new cylinder head.

- Keeps Hands Warm
- Keeps Beers Cold
- 2 Sided Print, 1 side 50 cal logo, other side slogan
- Multiple designs to choose from