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Honda MX & Off-Road Dirt Bikes
vp ultimate 2 fuel in eric gorr ported cr250
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[QUOTE="murphy's law, post: 748274, member: 35745"] John, I have the same mods done to my bike and i recently bought another 5-gallon drum of U-2. I haven't had the chance to ride long term on the new motor but i can tell you that i did not make any jetting changes when i switched from c-12 to U2 with my stock motor and there was no problem with detonation. Now, with the increased compression and race fuel specific porting, I'm not so sure but i can't see there being that much of a difference. If you want to play it safe just go up one on the main jet from your C-12 setting. I think mixing C-12 with the U-2 would take away from the potential increase in power that you would get from running it straight up. This is what I'm running for jets right now for C-12. 380 main 76 needle in second pos 30 pilot S-8 nozzle 2 1/2 turns a.s. v- force m/t eric gorr mo-better porting fmf fatty pipe and silencer motul 800t @ 32:1 I have started my bike and ran it on the stand with straigt U-2. ( it was too cold to take it out of the garage) I know that throttle respose was better and that the smell of U2 exhaust carried through my house like there was a 747 on the bike stand. Needless to say that I'm the only one that enjoyed it. Hopefully Eric or Rich will chime in with some more definative answers. [/QUOTE]
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Honda MX & Off-Road Dirt Bikes
vp ultimate 2 fuel in eric gorr ported cr250
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