This is a multi-part post.
It contains a series of animations that depict exactly what is inside the in-frame Chinese 2-stroke engines; as far as the clutch and countershaft are concerned.
At the bottom of each post there will be a still of the exploded assembly.
Some of the parts shown will appear slightly different, as these are parts that I make. The countershaft and clutch assembly are shown exactly as they come from the Chinese factory.