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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Could it be Ignition timing or worn crank seal?
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[QUOTE="georgieboy, post: 249091, member: 21186"] Blic, the powervalve has to close as close as possible to the piston as the manufacturer find safe. So between the piston, moving up and down in the cilinder, and the powervalve there shld be a gap, which you can measure. No gap means the piston-rings are hitting the powervalve. You definately don't want that to happen. But and other extreme is the gap is too large, so the powervalve don't seal enough at the lower revs. I find a leaking seal hard to believe as you mentioned the engine runs fine at top revs. So, when there are no birds dropping out of the sky by yr exhaust smoke, i feel safe to say you don't have a sealing problem at yr "wet-side". I also think you don't have a timing problem than, for the same reason. I think you have a pilot-jet clogged or maybe some leaking slide. Focus on the carb side. Have you fiddled with yr choke, to see whether the bad running is due to lean or rich conditions? [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Could it be Ignition timing or worn crank seal?
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