Treemonkey1000
Veteran Member
See if the threads in the head are buggered up. Also see if maybe there is a locking washer on the plug itself. Then use a good plug wrench to tighten it up fairly tight. Does the saw vibrate a lot? Like maybe a bent crank or flywheel weight is off? I have had plugs be loose before. The performance gets pretty bad though when they get real loose.