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Old 04-23-2016, 11:08 PM
Kletus Kletus is offline
Motorized Bicycle Senior Member
Join Date: Apr 2016
Location: oklahoma city,ok
Posts: 63
Default Re: Blew the Motah today o.O

Could have been a bad crankshaft oil seal. This will cause a super lean mixture due to air being partially sucked in through the bad seal instead of the carburetor thus leaning out the mixture. I've repaired several 2 stroke motorcycles that befell this fate. The best thing to do if you have a means to do it is to have the bottom end pressure/vacuum tested. It also could have a splitline seal failure or a crack in the crankcase. A quick and dirty way to check for a bad oil seal is to spray starting fluid around the seal area, if your engine picks up a lot of RPM you probably have a bad oil seal.

Last edited by Kletus; 04-24-2016 at 12:03 AM.
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