LonestarStihl
Addicted to ArboristSite
i ran the ms660 one more time because my tach was being funny for all my saws and its still racing at WOT. It idles perfect and does race when turned in any position. The only time it loses it is at WOT it goes up to around 16k RPM which is not good for that saw. Could it be the H screw is messed up and needs a new carb? I plan to take it in for vacuum/pressure testing because it could probably used being checked anyways. Thoughts?