If a race fuel has a lower specific gravity than pump gas and a lower lbs per gallon weight. Should it cause overall settings to be richer or leaner? The fuel is non oxygenated. 6.15-6.11 lbs per gallon (pump) 6.03 lbs per gallon (race fuel) .74-.73 specific gravity (pump) .725 specific gravity (race fuel) The fuel is phillips b32. The reason I ask is that I have had different people tell me one or the other. A phillips rep told me that it would cause a lean mixture, but he seemed unsure. I am trying to fine tune the jetting on my '01 426. I use 100% b32. The bike pulls hard through the midrange and on top, and it always has a nice tan plug, but it is lacking down low. I have the stock pilot #42, stock needle in stock position #4, 168 main. I have done the BK mod and have the spray set at .3 to .4. The spray is timed so that it just misses the slide without hitting it. (stock exhaust system) The problem I have is down low. It never hicups or hesitates, but it simply does not pull as hard as it should. I never realized this until I had a chance to ride a fellow TTer's bike, which was completely stock. (no BK mod) His bike simply had more snap than mine down low. (immediate opening of the throttle) I feel that I don't have the jetting dialed in for the fuel that I'm running. I want to keep running this fuel because I believe these bikes need a high quality fuel and the bike is very easy to start with it. I know many of you are running race fuels with excellent results. I would appreciate any advice you could give me on this subject.