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First question-if oil is getting in the combustion chamber from the gearbox would that make the mixture leaner? If so that would explain alot. But more important question.do you have to split the case to change the clutch side crank seal. Ive heard some say yes and some say no

If transmission oil gets in there, it will be a smoky bike.

This is an E correct? The crankcase MUST be split to replace the seal.

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