This is for 1969-79 z50s and 3 speed CT70s that already have our 88cc race head kit installed. This includes the 51mm stroker crank, proper matching piston, high volume oil pump, and necessary gaskets.

Fitment note – This is for 1969-79 z50s, 3 speed CT70s, and 1973-80 ATC70 that already have our 88cc race head kit installed