Golden Oldies
ArboristSite Lurker
I have a 550xp with about 25 hours of use. At times I've heard a rattling from the clutch side of the engine which has gotten louder. Recently, while cutting a log, I revved the saw up to finish a cut, and after releasing the throttle the revs would not come down. I stuck the bar into a block of wood and hit the kill switch. I restarted the saw, and as soon as I hit the throttle the saw idled up to max and stayed there. Today, we inspected the carb boot, and tested the clutch and mag side seals with ether and didn't observe any increase in RPM's. Spark plug looked normal, slight wear but good color. Muffler bolts were tight, and spark arrestor is clean. Could this issue be related to the "auto tune", this is the first saw I've had that has it? We weren't able to test the compression because of the tiny spark plug it uses.