Chainsaw Repair

How do they run as compared to stock? Or is the "skirt" close enough there is no difference either positive or negative? The prior owner claimed the local saw shop put a 288 piston in the saw. I don't think they did after tear down. Might have put 54mm ring with a 288 packaging label as that piston looks like the stock 2077 only 2mm less in dia. In articular spike60 had mentioned where the connecting rod/wrist pin sits in the piston would be different. Not having a new piston for either, I measured the stock 2077... which I do have and found the dimension to be the same. Looks like they just took the old scuffed piston and buffed it and stuffed it back in with a new ring. It didn't last a week apparently... so it's on my bench. There has to be another issue . Fuel starvation caused by something. So its getting a carb kit and hoses (Pulse & fuel) to hope I "shotgun" mechanic the issue. Hoping it's not case seals.... don't have a good bearing house to match things up with unless I go to Syracuse....Think  I may need to cob together a vacuum test for it.

I have a good 2077 52mm top end that's going on the saw for now though.