Originally Posted by kawasaki guy
If it has a 4 mix it is a
blower. I think the smaller 4-mix machines like the trimmers are fine, but I think the big ones like the backpacks would need too many valve adjustments from running on wide open throttle all the time.
That's not correct at all bro. It is a recommended one time adjustment at 139 hours, and even at that Stihl says " if necessary".