With BMW R35 we also received two spare engines for it. Here is one of them. According to its number it was made by the BMW factory in Eisenach in 1951. As you may see it comes along with an early type gearbox which has a hand operated gear switch lever. That’s good news cause that’s what we wish for the BMW project.
However, there is bad news: both the engine and gearbox are in most pitiful condition. Aluminum parts are oxidized and all steel and iron parts are heavily rusted. Here is a “walkaround” set of photos so you may see the engine and gearbox from all sides:
From the look of the engine and gearbox I could make a guess that they were used to propel some agricultural or household machinery. There are some modifications that indicate such usage. Here you may see the pulley welded to the gearbox output shaft fork.
There is a funny fact about this particular gear switch lever knob. It is a wooden counting piece from soviet abacus. Abacus is an ancient calculating tool also called counting frame. Abacus was largely used in the USSR for the first three decades of the 20th century.
Dismantling this engine promises to be hard work. Taking into account the condition of exterior parts and presumable usage of engine there is not much hope that a lot of parts could be saved.
However I hope that at least I could use a gearbox case and assemble a gearbox with a hand operated gear switch lever on its base. Parts for such vintage motorcycles are rare so it would be hard to find replacement for cases.