I know there has been alot of post about race gas and the debate to use it or not. I thought I would let you guys know about my results. Bought a used 1999 yzf 400 about 3 weeks ago. very clean and in great shape. the guy stated he used race gas in it all the time. I haven't check the jetting and have just be getting used to riding the bike. I made the change to super unleaded to save a few bucks on the gas and listen to most of the post of everyone stating that it didn't make much of a differnce. I'm sure it has alot to do with carb jetting but this old thing didn't like the change. Didn't like starting. It would take 8 kick to get it lit then It would backfire and stall. when warming up I couldn't turn the throttle at all because it would just cough and die. It would run fine after it warmed up but how frustrating. Changed back to race gas and the thing started on the 2nd kick and run awsome. I'll be using race gas for now on. even if i'll cost me 5 bucks a gallon. Just my 2 cents.