Hey all, My first time posting on here, but I have browsed the forums many times looking for answers to other questions. Thanks in advance. I have a FS 250 brushsaw that starts fine, idles fine, but won't get up to speed. When I depress the throttle, it just kind of makes a low growl and the blade won't start spinning (the blade spins freely by hand). I noticed the exhaust was oily, so I took the cylinder head off to see if it was all gunked up inside. It was not, but I did notice some buildup on the top edge of the piston, while the piston crown was covered in a dried, oily scale. I also cleaned the carburetor thoroughly, as well as the air filter. It's all back together, and is still behaving the same way. Could this be a compression issue?