Long stroke experiment

A new experiment to get some more torque out of the 50cc engine, as it is originally a short stroke, at 35,6mm with a 42mm bore.
Now a test using an XR75 cranck wich has a 41,4mm stroke, just like an SS50.

Cylinder is sleeved to get to a 39mm bore, combined with a GB2 piston, originally of an engine with horizontal cylinder.

Tomorrow its first run....