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Everything Dirt Bike
General Dirt Bike
KX250 cutting out. Help!
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<blockquote data-quote="ossagp" data-source="post: 191827" data-attributes="member: 1650"><p>like your piston is seizing. if it is really lean it just acts, well, like it ran out of gas, on its face, dead, catches back on as you roll the throttle back. Usually when someone tells someone that a bike that misses on top end has a main jet that is too small I cringe a little for them. I can believe that an air leak etc can cause some problems, but as the weather warms up your jetting should be leaned out to prevent the richness that comes with less oxygen in the air around you. If yours all of a sudden NEEDS a bigger main jet, you have to track down the reason and not just swap jets in my opinion. If you do a throttle chop test it may tell you that your jetting that was fine for colder weather is now too rich for the current conditions, but i think if i were you i would want to test it with the fuel a little bit freer flowing.</p></blockquote><p></p>
[QUOTE="ossagp, post: 191827, member: 1650"] like your piston is seizing. if it is really lean it just acts, well, like it ran out of gas, on its face, dead, catches back on as you roll the throttle back. Usually when someone tells someone that a bike that misses on top end has a main jet that is too small I cringe a little for them. I can believe that an air leak etc can cause some problems, but as the weather warms up your jetting should be leaned out to prevent the richness that comes with less oxygen in the air around you. If yours all of a sudden NEEDS a bigger main jet, you have to track down the reason and not just swap jets in my opinion. If you do a throttle chop test it may tell you that your jetting that was fine for colder weather is now too rich for the current conditions, but i think if i were you i would want to test it with the fuel a little bit freer flowing. [/QUOTE]
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KX250 cutting out. Help!
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