How do you know you can't run pump gas? There's a book full of questions we could all ask to steer you in a certain direction. As we all know very well the only way to know exactly what you have inside is to take of apart. If it's a summer fling I guess run it and hope for the best. If you plan on keeping it I'd tear into it and see whats in it so you know what kind of fuel you need. Or read up on compression and compression ratio and how to check it. Most everybody runs a BR8ES or B8ES. Especially on a stock bike. Jetting could be a little rich if last guy wasn't running 40:1. Once again need to look into the carbs and see what you have for jetting. It'll run off that just fine as long as it's set up for it. If it's leaking oil out the pipes the seals aren't working. Fix that. Then if it's too rich it'll eventually puke it out the ends of the silencers.