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Enduro Engine - 2 stroke Cylinder, Piston, Tranny, Bearings, Clutch, Pipes & Silencers, etc.

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Old 10-15-2009, 09:49 AM
Dirt Addict Dirt Addict is offline
Join Date: Oct 2009
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Default Crank seal leak?

i heard that some gassers were known to have a problem with leaking crank seals.
is it possible this would cause a lean condition on the motor?

also the plug on the bottom end ( not the gear oil drain) , could it be leaking?

06 EC250 in Socal
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Old 10-15-2009, 11:34 AM
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GMP GMP is offline
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I never heard of it being a problem, but its possible on any 2-stroke. The ignition side seal failing could cause a lean condition. Remove the ignition and look for signs of leakage, if the seal is bad enough to be a problem it will leak in both directions. Its easy enough to swap if questionable. The drain plug leaking would be a first, but it doesn't hurt to check. A quick and dirty way to do a leak check is spray some engine start fluid near the suspected area, if your pulling in outside air the RPM will increase. Best is a pressure test.
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