I don't set saws by tach, its too misguiding. Too much that can go wrong. I set them after performance. When they run at its best its usually a great place to be.
Ignitions today is a bit trixy and can fool ear Not easy to hear differance on fourstroke and limiter.
Usually if its not a modded...
A clutch that is engaged and under load rarely wear excessively. If you have saw in low rpm were clutch engage, disengage all the time that will stress and wear out clutch prematurely.
Most common cause for chain moving on idle is too high idle.
To high idle screw setting is common on saws...
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