Athena Hyper Racing cylinder for vertical minarelli / 1989-2001 yamaha zuma 70cc

New athena racing cylinder claims to bring new technology to the vertical minarelli engine. We recommend pairing this with a racing exhaust, crankshaft, and larger carburetor! 

This cylinder is strongly recommended to be run on a reinforced crankshaft!

Bore Diameter (mm) 47.6
Compression Ratio 13.8:1
Displacement (cc) 70