Homelite XL (UT-10655) 16” Need some experienced help on this one please. Saw cuts small stuff well, go to cut bigger stuff and the chain will stop moving... I may have had the chain on a little too tight (still trying to learn that), but I can rotate it with a gloved hand. Took the saw apart and the clutch and drum appear to have gunk on them. I will clean these up (leaving the clutch on the saw) and see if that helps, but wanted some expert thoughts on this. Is the clutch shot, or is the drum worn out and a new drum will help? How can one tell? Appreciated!