Yamaha Vertical Minarelli Stage6 Streetrace 40mm 50cc Cylinder Kit aprilia this is likely the one

this is likely the one you need

Comes with a very large matching head to keep this kit cool

This is not original CEV

New old stock fan base for Minarelli V1

Yamaha Vertical Minarelli Stage6 Streetrace 40mm 50cc Cylinder Kit aprilia this is likely the oneStage6 Streetrace 40mm 50cc cylinder kit for Vertical Minarelli scooter engines. These were commonly found on early pre bug type Yamaha Zuma, BW'S, MBK Booster, etc. Very nice looking cast iron kit. Stage6 claims these are good for 7 or so horsepower when paired with a 17mm carburetor and sport touring type exhaust. 2 ring piston with stock style 10mm wrist pin. Comes with cylinder, piston, rings, pin clips, head, base gasket and o ring for head.