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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1999 YZ250 No power High RPMS
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[QUOTE="Rootuser, post: 1112091, member: 70692"] [b]Power Valves[/b] There are power valve covers to remove and you should probably remove the pipe to get at everything. They are like a little extra section on your cylinder head that isn't quite part of the cylinder.... kind of hard to describe.... As for reeds, if you had a broken reed the bike would not idle at all I believe so I doubt it's a broken reed. You mention 3/4 throttle.... Is your pin setting correct? Beyond 3/4 throttle however does not effect anything as you are wide open and it's all up to the main jet at that point. I am having a VERY similar problem myself and I am working on diagnosing it tonight I think. In the mean time check out this thread: [url]http://www.dirtrider.net/forums3/showthread.php?t=141770[/url] It may shed some light on possible things to look at. -- Rootuser [/QUOTE]
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Dirt Bike Discussions By Brand
Yamaha MX & Off-Road Dirt Bikes
1999 YZ250 No power High RPMS
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