My ETZ 251 has a persistent transmission oil leak, coming from a cast-in recess on the drive side of the engine, in a raised boss that it shares with the tapped hole that houses the neutral switch that’s right next to it. It’s heavy enough to leave a small puddle, if the bike is left parked for a few weeks.
There appears to be the end of an internal engine shaft visible inside this recess, which is pretty illogical!
See the leak source indicated by the screwdriver in the pic below.
It’s been leaking from here since I bought the bike 3 years ago, though with little use, I’ve so far just put up with it.
Looking at parts and workshop manuals, there doesn’t appear to be anything missing that might seal this hole and there are no threads or circlip grooves to retain any such plug.
I’m not inclined to split the motor to investigate, without first finding out a bit more about this, so, do any of you good folk know why there is oil emerging from this part of the motor, and if so what might be done to stop it?
Regards, Drew