This sound is recorded directly from one of my original 1938 98cc light motorbikes. This time is a express (manufaturer) sl 102 (type). The noise you hear is all specific. It is the fuel cock on selection, the flooding of the carburettor, suction of the engine, two tries to bring the engine to live with clutch action inbetween. Running on idle and two short openings of the throttle. Engine is shut off by using the decompression lever which is typical for this period of time and two stroke engines. .
Author: Achimengels