TB parts V2 Race Head Kit & 56mm/140cc Piston Kit. This kit includes everything needed to upgrade a YX140(56x57mm bore/stroke) with our V2 Race Head.

TBparts V2 cylinder head’s larger stainless steel (21-4N) valves, better porting, roller cam, and forged aluminum roller rocker arms that allow the engine to rev quicker, farther, and make much more power than other race heads. Combine that with our matching high compression, lightweight piston and this kit adds a professional level of performance at an affordable price for the privateer rider. These are high quality, bolt on parts! 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 – Aluminum roller rockers, 28.5mm intake valve, 23.5mm exhaust valve, 26mm intake port, 23mm exhaust port, covers and hardware included (valve, seals, and springs installed).
• Race Camshaft
• 56mm/140cc High Compression Light Weight Piston Kit (91+ octane pump fuel friendly) (13mm Wrist Pin)
• Top End Gasket Kit
• We stock all the replacement parts for this kit, no ridiculous wait times or prices for these High Performance spares.

Note: This kit is for YX140 (56x57mm bore/stroke), Piston pin is 13mm 

Kit includes:TBW0751, TBW0821, TBW0752, TBW1441, TBW0414, TBW0804, TBW0862