I bought a pile a crap a while back and in the pile was a 311 saw. No bar or chain and the factory air cleaner cover and filter was gone. They guy that had it took a chunk out of an old foam mattress and stuck it on the carb as an “air filter”. I got it to run good and put a bar a chain on it. It cuts ok but compression feels low. I talked to the dealer a top end is almost 500 dollars and just a piston and rings is $225. Is it just me or should the piston and rings be more like 50-75 $. I think they do this on purpose so you buy a new one