I bought a 77 r80 at the end of last year. It has been standing for around 15 years, but has some history before that but nothing clutch that I can see. I sorted out a fair few electrical issues, completely stripped/cleaned/rebuilt the carbs, complete refurb of the calipers and M/S, replaced some perished rubbers on the forks and final drive etc. etc etc It starts, runs, sounds and handles fine BUT the clutch slips something awful when cold. Give it a few miles and then she's fine. I've adjusted the clutch cable/arm according to a couple of sets of instructions (which are pretty similar to be fair) and also backed the arm adjuster, on the transmission, a fair bit out but no real effect. The clutch disengages fine and is light in use. There aren't any oil traces externally to indicate leakage inside. I don't know why the bike came off the road originally. Mileage is very much unknown, but it's ex-plod. It's been stored somewhere nice and dry tho, as there was no aluminium, chrome or paint damage. Is there anything else I can look at externally, before pulling the gearbox ? Could this be the throwout bearing ? I'm tempted to ride it and see if it sorts itself, after all it's been stood a while with the plates glued together. I've had british stuff, in a similar state which sorted themselves after some use.