Compression is 180 on a new Meteor piston and the OEM Mahle cylinder. The base gasket was removed but no other mods where made to this saw. I added a muffler deflector due to the original one missing and it needs to be brazed on to keep the screws from backing out. The top cover has a small crack and I had to make an idle screw for the carb. The saw runs very strong and should make a good 'ol work saw. Please feel free to ask any questions and I might be willing to due some trading for other Husky or Stihls. Asking 375.00 + shipping