Derbi Airsal 44mm "65cc" Cylinder Kit ad though the port finish isn't

though the port finish isn't as nice as the genuine Athena

This is a big kit

Vespa made it easy with three cylinder studs instead of four

Piston has both a boost window and large scallop in the skirt

Derbi Airsal 44mm "65cc" Cylinder Kit ad though the port finish isn't65cc cylinder kit for Derbi Flat Reed. Some really love this particular kit more than the others. Aluminum with nikasil plating. 2 ring piston. Solid, reliable performance. Lots of room to get creative with porting. Some have reported issues running this with the stock Derbi head. You can always plug up your decomp or make the jump to one of the aftermarket options. Comes with cylinder, piston, rings, pin clips, hardware, and gasket set.