This kit is for upgrading 88cc bore kits with a stock head to the Race head.
TB Parts Race Head kit. This allows you to upgrade your 1988 or newer Z50, XR50, or CRF50 that already has our basic 88cc kit with our race head V1. This kit includes our complete race head and camshaft ready to bolt on with the matching piston and gaskets. We also include our port matched intake for use with our 20mm carb or other appropriate 48.5mm flange mount carbs.
TB Parts V1 race head features a much larger 25mm intake valve and a 22mm exhaust valve. Both made from stainless steel (21-4n) for superior quality. Next the ports are designed to match the new larger valves that have also been angled for better flow. Combined with the performance cam we use and you will feel a large power difference with our V1 race head.
Key Features:
- Race Head Large valves (now 25/22mm) and better flow for increased performance. Fully Assembled
- Bigger cooling fins. Includes all necessary parts and comes assembled
- 52mm piston with rings, pin, & clips.
- High performance race camshaft (for the Race Head only)
- Head gasket kit.
- Intake kit for the race head
Application:
Honda Z50 1988-1999 (*91 and older See note below)
Honda XR50 & CRF50 All Years
Honda XR70 & CRF70 All Years
1991 and older engines will need TBW0861. We recommend purchasing a high volume oil pump kit (available in this section TBW0226). It will save a lot of time and effort if the oil pump is installed while installing the bore kit (requires cylinder removal). For use with our 52mm cylinder only.
Kit Includes:
TBW0365 - Piston Kit
TBW0206 - Gasket Kit
TBW0273 - Intake Manifold
TBW0300 - Race Cam
TBW0385 - Race Head & Valves Assembly
