I just picked up a Dolmar 120 knowing it was a little tired. Compression tested a bit low (around 110) but the saw does start and does an ok job. Bucked a bunch of seasoned Alder with it today and it had no problems but the other day when I tested it at the sellers house it was having a hard time in a bigger piece of Maple. No scoring on the piston when viewed with the muffler off so may just need ring/s. Just wondered if anyone has ever made a 120 into a 120 super and if there were any obstacles besides cost. Also, what are the difference besides CC's between the two saws?