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Yamaha MX & Off-Road Dirt Bikes
Sunoco 105 Octane ??
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[QUOTE="Rich Rohrich, post: 61760, member: 16241"] The lean effect will be across the board. The 250F seems a bit lean to start with so plan on breaking out the jets, and probably adjusting the needle. As long as you get the jetting correct you'll see a noticeable improvement on the track. As for HOW MUCH horsepower? Fuel testing is pretty difficult to isolate on generic dyno setups, so I tend to ignore most horsepower claims. To do it right YES. If you are concerned about it don't bother. It's a LOT of testing for a small return with a fixed curve non-adjustable ignition system like the stocker has. The 250F doesn't need additional octane so OTC boosters are of ZERO value on this bike. They will do far more harm than good in the 250F or the big YZFs. ------------------ Rich Rohrich == "Wisdom is not a product of schooling but of the life-long attempt to acquire it." - Albert Einstein [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
Sunoco 105 Octane ??
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