IMO, '81-'84 R65's are great bikes. I have never had any trouble getting parts for them? A good friend of mine got tired of me out motoring him on his R50/2 so he got a R75/6. He said he was going to take me. He said that R75/6's made more power than R65's. I said maybe when they were new but yours doesn't. My R65 could walk away from it. Then he got a R90/6. Same story. Then he got dual plugged, pistons, a 336, and Dellorto's for the R90 and he could out motor me. What the book says and what they are are often two different things entirely.