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According to the manual for a Stihl KM 91-R, "A factory new machine should not be run at high revs (full throttle off load) for the first three tank fillings." I find the bit in parentheses very confusing. Can someone explain what exactly I'm NOT allowed to do during the first three tanks? Am...

My Stihl KM55R (KombiMotor) is starting and revving fine, but the shaft doesn't turn with the motor, like the shaft is disconnected. I'm talking about the part that engages and drives attachment tools like string trimmer and edger. What should I be checking? It's occurred to me to remove the...