I'm leaking oil/gas from around the cylinder base and I'll be replacing the base gasket and the 2 o-rings on my 2001 yz125. I was wondering when doing this, do I have to take apart the powervalve housing and the push rod? After I remove the cylinder head and the cylinder nuts I should just be able to lift off the cylinder and put the new gasket on right? Oh and the manual calls to use lithium soap base grease on the o-rings. Would a white lithium grease work? Any tips would be appreciated.