TB parts Honda Style Race Head V2 Kit. For use with the 13mm wrist pin 125cc & 140cc engines (57mm Stroke) (YX, GPX, Piranha, Jailing).
This kit converts an existing TBparts 146cc/57mm big bore kit with a stock head to the V2 Race Head. The V2 cylinder head’s larger stainless steel (21-4N) valves, better porting, roller cam, and forged aluminum roller rocker arms allow the engine to rev quicker, farther, and make much more power than the stock cylinder head. This cylinder head adds a professional level of performance at an affordable price for the privateer rider. These are high quality parts – bolt on and go! There are no installation instructions, but if you can replace your piston, you can install this kit. If you don’t have any experience working on your engine, we highly recommend having a professional technician install this kit or, at a minimum, purchasing the shop manual.
Key Features:
- Race Head V2 (valve, seals, and springs installed) covers and hardware included!
- 28.5mm intake valve & 23.5mm exhaust valve
- Forged aluminum roller rockers
- Race Camshaft
- 26mm intake port, 23mm exhaust port
Note: This is only for use with 13mm wrist pin YX, GPX, Piranha, Jailing 120cc & 124cc engines. This kit will not work with the common Chinese 125cc 54x54mm engine. Engine disassembly is recommended to ensure this kit will fit.
Installation Note: Do not use the original o-rings between the head and cylinder (not needed) but do use the large o-ring at the bottom of the cylinder between the cylinder and the engine case at the oil return.
Kit Contents by Part Number: TBW0751, TBW0821, TBW0752, TBW1441, TBW0414, TBW0823, TBW0862
