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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
fouling plugs
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[QUOTE="YZThumper, post: 672695, member: 24412"] Same thing happened to me on a YZ 250 I owned. Bike ran great for 2 years, perfect carbureation, throttle response, and no changes to anything other than top ends. One day out of the blue it began to foul plugs. Usually this happens to guys who are lugging it while riding tight trails, but this happened to me even when the bike was being ridden flat out. Turns out the crank seals and bearings went south and it was sucking oil which caused the plugs to foul. If you haven't messed with the jetting, it's more than likely not the jetting. Take the stator cover off and check for play in the crank to see if the bearings are truly shot. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
fouling plugs
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