cyclerider57

91 octane pump fuel. And I don't know what dyno you guys are using but compared to a lot of other race fuels VP U4.2 sucks balls. U4 was awesome but gummed up and needed drained so they created 4.2 which isn't supposed to be as hard on o-rings and need drained as soon. I haven't seen gains with 4.2 over high quality pump fuel. Only a harder time keeping jetting correct and more expensive fill up. MR9 and others will blow U4.2 away on the dyno. We dumped out the last 2 gallons of 4.2 we had because it was too much of a pain in the azz to even setup the practice bikes with it to burn through the stuff. U4.2 is marketed to motocross racers because they don't have as much access to dyno and other equipment to check the internet claims of many.

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