1971 CB750 oil leak. Replaced countershaft seal to no avail.

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1971 CB750 oil leak. Replaced countershaft seal to no avail.

Jakevidio
I've got an oil leak (about 1 quart per 100 miles).  The best I can see, it's leaking from down low on the rear of the casing, where the chain is coming out.  Some mechanics swore it was my countershaft seal and encouraged me to let them replace it.  They said they replaced another one of the smaller seals right nearby as well, but the leak has not let up one bit.  I paid $230 for this bogus repair and the guys won't even inspect it further to see what else it could be.  Did I just get taken for a ride?
Any insights based on location and intensity of the leak?