[NO NO NO E-Z-GO!]

Originally Posted by NetMXer

...I'll give WD40 a try.

Not a good idea! I would probably remove the clutch from the engine and disassemble it, clean it piece-by-piece, give all the moving parts and touching parts a lube job with graphite or another dry lube, and stick it back together and on the shaft. Wet lubes are not good for these clutches as they attract dust and dirt.