I'm new to 2-strokes. I just bought a 1987 polaris Cyclone 250x. The guy I bought it from said the automatic oil injector failed, so he just started pre-mixing his fuel. The problem I have is he said he was putting 8 oz of oil for every gallon of fuel. I may not know too much but that sounds like alot! when I ran it it filled my garage with smoke. I cant find any info on what ratio to mix. What do you guys think? he said it was bored .020 over, if that makes a difference.