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98 yz 400 clutch ?

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Sorry if this is ignorant...but I picked up a 98 yz400f cheap to try out a 4 stroke, before I buy a new one and give up my 2 stroke. Anyway I changed the oil and put 20-50 weight in it, as I have a tendency to be hard on engines and now the bike creeps in first and I don't think the clutch ever fully disengages (very sticky). Is this caused by the weight of the oil? it did not do it prior to the oil change. Perhaps I need to put a new clutch plates etc.....but if I can go back to a lighter oil and solve the problem short term that would be great. Your wisdom/experience is appreciated.

Cheers, MTB

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Sounds like you may have used Energy Conserving oil in it (it has moly that makes the clutch slip). What oil did you use?

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ya pretty much every brand that u can get at your local walmart is energy conserving. Great for cars, bad for bikes. Id suggest shell rotilla.

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