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Understanding jetting on 99 YZ400
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[QUOTE="Tony Williams, post: 119758, member: 17759"] [b]Mammoth YZF jetting[/b] I made the mistake of arbitrarily reducing the jetting from stock several sizes leaner all the way around for my trip last year to Mammoth. Ran like doo doo. Using the stock jetting ran great at 7000 feet and 75 degrees, which, of course, means it's a bit lean at sea level, particularly cool mornings. The single biggest benefit I've found was the next size larger needle, which by itself, cured the off idle stumble that many of these bikes experience. If you're pushing 40 years old or more like me, you can tune out the mega mid range hit with jetting also. Fun to play with. [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
Understanding jetting on 99 YZ400
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