>>28708764
>the transmission and the engine are one unit
Don't harleys have belt drive transmissions that are separate?
Then there's moto guzzi with old school separate transmissions like in a car.
Pre-unit construction bikes in general had separate transmissions.
>>28708661
There was an anon with a Harley from the 30s. I've an Ural from the 50s or so, a KMZ specifically with an M72 engine from 1943 or so, a war era motor anyway.