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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
250f mod options
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[QUOTE="Rich Rohrich, post: 141873, member: 16241"] [b]Re: Race Gas in Yamie 4-strokes-[/b] With all due respect to Mr. Scheidler assuming ALL race gas will have the same characteristics and cause the valves to (in his words) "gum up" while pump gas will magically escape this dire fate is [b]ludicrous[/b]. Anyone who is attempting to extract real performace from these engines and thinks they will do it with the random supply of chemicals sold as "pump gas" is sorely mistaken. Pump gas is fine for the weekend warrior who rides for fun a couple of times a month and won't ever touch the jetting. Racers who use pump gas while bouncing the engine off of a 13.5K revlimiter are missing out on power and response. The 250F and 4xxF engines might not blow up on pump gas, but you can be sure they are far from optimized under these circumstances. For your situation where you see a major swing in altitude density between your two riding areas, it would be very easy to jet the bike for the cooler high density area using a leaded race fuel like VP12, Phillips B32 or something similar, and use an oxygenated fuel like the VP MR series or Phillips B35 for the warmer lower density area. The change of fuel may be enough to balance the air denisty change once you get it dialed. [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
250f mod options
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