If you have upgraded to a freer flowing exhaust than stock, you should consider a 152.5, 155, or 157.5.  I had the best luck with a 152.5.  If your exhaust is stock, I would not exceed a 150.

still stock exhaust, got a 150 main, installed as of about 5 minutes ago. Where are the links to the interlock switch bypass tricks? While the seat is off I think I will take the opportunity to ditch some of those "safety" features. I don't like being stranded. I am gonna try to solve the speedo vibe thing too. Any clues you folks have to offer are taken with a lot of appreciation. Can I poke a hole or 2 in the rear of my exhaust? Will it help anything?