Honda TRX90 114cc Race Head Bore Kit w/ Mikuni VM26 Carb and Race Cam - TBW9146 Clutch a roller (not included) is

a roller (not included) is recommend – there is a perfect spot on the Z50 frames to bolt or weld on a roller (you can see the roller in one of the bike pics above)

A great upgrade to give your 2013-2018 stock bore bike some more power

Converts the following stock models to 88cc:

Head gasket

Honda TRX90 114cc Race Head Bore Kit w/ Mikuni VM26 Carb and Race Cam - TBW9146 Clutch a roller (not included) is114cc Bore Kit, Race Head, Mikuni VM26 Carb Kit and Race Cam Fits: Honda TRX90's (all years) NEW Race Head Larger valves (now 25 22mm) and better flow for increased performance. Also has bigger cooling fins. Includes all necessary parts and comes assembled! High performance race camshaft Lightweight aluminum cylinder with steel sleeve (huge weight savings over your stock cast iron cylinder) Cast in mounts on cylinder for aftermarket skid plates