Bad moon rising, I've been using 50:1. The manufacturer called for 20:1. You say at least 32:1. Is 50:1 at least 32:1? I use bel ray mc1 or h1R, whichever one is available at the time. I noticed with 89 octane the engine sounds like dodo. I bought a tank of racing fuel and it sounded better. Now I'll just get the 93 octane at the pump. Is it ok to add octane booster to it? It was just an idea I had. And is bel ray very good for these old quads?