The chassis is from a 29S engine and the first number is S6 from 1936.

The special thing about this engine is that it is a 600cc of which the flywheels are polished like those of the racers, there are racing camshafts in it.

Exhaust 52mm and carburettor attached with flange. And on left side wider crankcase for double bearings on crankshaft.