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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
250f mod options
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[QUOTE="holeshot, post: 142551, member: 17202"] [b]Re: Race gas and geriatric tracks[/b] I was there with the ROTMX two years ago and never returned, so I [b]did[/b] go somewhere else. I may give the track one more shot (I'm getting geriatric, after all). This is one track where you can arrive with a '73 Maico and lay some whoopa$$ on someone riding a modern machine. As for race gas, I've tried Unocal 76 (110 octane, I think, out of 50 gallon drums from Montclair Yamaha) and VP-12 in my 426, both straight and mixed with pump gas. There was some difference in how the bike responded, but I don't ride more than half throttle anyway.:silly: Your experience on the 250F may vary. If I were motivated, I would run about 1/3 race gas to pump gas, just to hedge my bets against poor pump gas, and to allow the same jetting as straight pump gas. It was fun experimenting with different fuels and jetting, and it was interesting to see how quickly VP-12 evaporated when spilled on the garage floor, indicating a much different chemical makeup than pump gas (far more light ends content, or at least "lighter" light ends). Much of the neighborhood could smell the fuel, and were expecting a [b]big[/b] explosion. :) [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
250f mod options
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