[Bret]

I'm not sure about the sloper CB/CL175, but if it's a vertical CB/CL175, remove the oil drain plug from the bottom of the motor. There is a case bolt hidden behind it. I've split a couple sets of vertical cases while building my racebike motor and it's the only hidden bolt I can think of.
If it's a sloper motor, ask Mr. Branson.

Cheers, Bret @ Glass from the Past