TBparts V2 Race Head Kit & 52mm/88cc Bore Kit. Converts the following stock models to 88cc: 1982 and newer Honda Z50, XR50, XR70, CRF50, CRF70, & 91-94 CT70

Starting with the 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 the stock setup. Add the high compression 52mm bore kit that brings up the bore to 88cc and makes for a strong power band adding up to a professional level of performance at an affordable price for the privateer rider. These are high quality parts and require no machining to the cases or other modifications – 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 – 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
• 52mm Aluminum Steel Sleeve Cylinder
• 52mm High Compression Light Weight Piston Kit (91+ octane pump fuel friendly)
• 52mm Top End Gasket
• No case boring
• We stock all the replacement parts for this kit, no ridiculous wait times or prices for these High Performance spares.

Note: Only for use with 1988 and newer Honda Z50, CT70, XR50, XR70, CRF50, CRF70, & 91-94 CT70

Kit Contents by Part Number: TBW0750, TBW0755, TBW0752, TBW1441, TBW0753, TBW0859, TBW0156