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72cc Bore kit for Honda 50 & 70 This 72cc big bore
Kit will fit the following models:
Honda: Z50R 1982 -87
Honda:XR70 & CRF70
Lifan: -50cc and 70cc Motors Zongshen: -50cc and 70cc Motors w/ e22 standard heads
Other 50-70cc Pit Bikes and ATV's with replica Honda horizontal motors
Increase your displacement on 50cc models, or freshen up your tired 70cc top end.
This is the only kit with a 47mm ALUMINUM cylinder on the market.
Aluminum cylinders dissipate heat more efficiently and weigh considerably less than the cast iron competition.
Replacement parts are in stock if you need them.
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Pit Bikes 
