51mm diameter piston (85cc) for Honda Monkey, Dax, Gorilla, Chaly, SS50.
The piston is suitable for a 6v 50/70ccm engine in combination with a 50cc 6v cylinder head.
The piston is ~ 1 mm higher than the std. Honda piston, this must be compensate with an extra head or base gasket.
Compression ratio: ~ 12.5/1