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Dirt Bike Brands - Other
TT-R250 Bogs downlow?
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[QUOTE="Magellan, post: 78045, member: 22253"] I'm roughly at sea level with temps in the 60's. I did a plug chop at full throttle and it looked good. I have an NGK chart that I got off the net and the plug matches one of the "good" ones, but it is a bit on the lean side. The more I think about it, the more I am convinved that the transition between the idle circuit and the mid circuit is the culprit. By raising the needle, the mid circuit comes on richer. Maybe too rich if the bike is coming off idle quickly. In other words, the engine isn't spinning fast enough to use that much fuel. This makes sense as when I got the problem to go away completely, the bike started to rev high at idle once it warmed up, which indicates a lean condition. So leaning out the idle circuit fixed the burble, but wasn't a good solution as it had to be too lean. Putting the needle back to stock and going up on the main should richen the upper half of the midrange circuit (where it overlaps with the main circuit) without affecting the idle circuit.... Stay tuned for my results... Oh yeah, email me if you want a copy of the plug chart. Mag [/QUOTE]
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Dirt Bike Discussions By Brand
Dirt Bike Brands - Other
TT-R250 Bogs downlow?
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