Ok, couldnt find new chain for the saw (sure I have one) so sharpened old one for last time I think (teeth are at limit if not beyond). Anyway it started right up with fresh gas. However when I went to cut, chain would stall with motor fully revved unless I just barely touched the wood. Looked and plenty clutch lining and from what I could see lining doesnt look oily. I didnt take clutch apart (not up to that big of a job today) but would assume either glazed lining or rust on centrifigal parts keeping clutch from fully engaging. Anything I can spray to loosen centrifigal parts without getting lining greasy? By way this is a 3.7 cu in Sears/Roper from 60's/ I am suspecting corrosion as I used saw last spring and dont remember any problem.