This is my first post, and I'm hoping somebody can help me out. I just picked up a 79 XS750SF. Bike looks like it was well maintained, but when I started it up, gas started pouring out of the air box after a few min. Thinking that it was a stuck float, I pulled the carbs off, cleaned them completely, and put everything back together. When I started the bike again, gas started leaking from the air box again. The only thing I can think of is that I may have been running the bike with the petcock on PRI. I've never had a bike with a "prime" setting on the petcock, so I was unfamiliar with what that setting was. Could this have been my problem?
