Question about 2000 Husqvarna WR 250

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Possible seal failure

Husqvarna 1982 250 XC
This bike was in storage for years with no oil in the gearbox. I recently got it running. It ran strong the first day out but seized on the second day. I think the culprit was a small piece of varnish in the main jet causing it to run very lean all of a sudden.
I am having it bored now. With the top end off, if I turn the crank with the bike on it's kickstand, I see oil coating the downhill side of the crank. I did not think there was supposed to be oil in the crank case below the piston in a two stroke.

Should I be able to see oil in the bottom end with the cylinder and piston removed or is something leaking?

Thanks for your help

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Gearbox oil may be getting into the crank area. Check the oil in the crank, is it motor oil or two stroke oil? If it is motor oil then you will need to split the center case and clean/re-seal the case halves. Be sure to install new crank seals. New crank bearings? If 2 stroke oil, just put a cup of gas in the crank to thin the oil, rotate the crank a few times to mix gas and oil, then just tip the bike over to dump the mix out of the case. If the bike has an oil pump, see if you can lessen the stroke of the pump. If mixing 2 stroke oil in the gas tank, Be sure to use only 2 stroke engine oil at 32 to 1 ratio. That equals 4 ounces of oil to a gallon of gas.

Posted on Nov 21, 2009

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