MAMOD PISTON|STATIONARY ENGINES SE1 SE2 SE3
Owing to the possibility/likelihood of historical manufacturing variations,
check if this piston is correct for your particular engine.
Here are the dimensions you ought to be sure about:
The piston length = 11.41mm (that's the piece that slides inside the cylinder when running)
The rod length to crank pin hole centre = 64.00mm (not including the piston)
Total length of this piston/rod assembly is therefore 75.41mm
Piston dia. is 7.94mm.