I have an 86' and I ran bel ray mc1 and just before I stopped riding it, I bought some h1R, ran 50:1 on pump gas(91 octane), it only had problems with cutting out after any extended period of Full throttle. I bought some racing fuel and mixed the oil to 30:1. It ran a tons better  I just bought an 88' but it doesn't run, so I couldn't tell ya what to mix for the power valve years. It looks like a majority of people are saying 32:1 or better. Me, I couldn't care less if it smokes. I'm going the other way. Lol