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Yamaha MX & Off-Road Dirt Bikes
Advice on Octane Boost for 2002 Yamaha WR250F
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[QUOTE="Rich Rohrich, post: 487313, member: 16241"] With pump fuels it's a common practice to add additional oxygenate to attain a higher pump octane number. All else being pretty much equal the oxygenates have about 10-15% less energy (BTU/lb of fuel) than the base premium fuel. So, without correcting for the differences the engine runs a bit leaner and can conceivably make a bit less power (via overly lean jetting and lowered total energy) and have to use larger throttle openings riding the same areas which would tend to use more fuel . If you jet for the additional oxygen in the chamber by adding more fuel (either closed loop EFI or changing brass in a carb) you'll likely see a mileage decrease as well (more fuel flowing through the jets) but you'll also make additional power. Fuel efficiency and horsepower seem to be opposite sides of the same demon coin :p It can be tough to get one with out giving up the other. If you are talking about non-oxygenated fuels, then changing from one pump grade to another shouldn't have much of an impact on economy either way. But pump fuel is totally unpreditable so your [b]mileage may vary[/b]. (Pun intented :thumb: ) [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Advice on Octane Boost for 2002 Yamaha WR250F
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