|Sachs 50cc racebike.
I havenīt had a Sachs engine in my hands since my motocross- days in the seventies.
Back then the Italian built Simonini had a 6speed engine, which now is known as the
longstroke version. The early version having a bore and stroke of 38/44mm were
replaced by a new engine in 77, a shortstroke with 40/39,7mm dimensions.
The new version retained its outer dimensions, transmission and clutch layout.