Just bought a 1975 175 enduro. Seems to be low-use and the only modifications I see so far is the removal of the battery and turn signals. The transmission does not shift from 3-)4. The clutch was stuck when I first started the bike, I was able to get it to work, but I noticed oil in the clutch area, leaking around the shaft seals. Is this seal replaceable from the outside if I remove the clutch basket ? I am also looking for a source for the special tools for working on the motor. Thanks in advance for any help you may provide.