Hi, I'm working on this Vespa Grande for a freind. I was just to replace tghe coil but on a test drive with the new coil it starting making a really loud clacking noise fromt eh rear. it does this while sitting on the stand and while under load. it seem sto have osmething to do with the clutuch. What could this be and how do i get into that clutch pully to fix it?? Is there a grease nipple i missed that may need some lubrication?? Any help is greatly apprecialted.