I have a 661 that while I was cutting seemed to bog In the cut. I’ve read where guys have had electrical issues but I think mine is the piston/cylinder. I put a compression test on it and it was right around 130 which is low but how low can these go reliable, starts and revs fine but doesn’t seem strong while cutting. I did take the cylinder off and piston I have some pics tell me if you think top end is my issue or not. Piston pic is exhaust side as well as the cylinder where u see two lines is exhaust side. There not really deep at all if it’s the top end would you do cylinder along with piston or just the piston? And are there any off brands that work well vs oem parts.