I have a Homelite  EHRL 4400  approx 30 years old. I,m sure there can,t be 50 hrs run time. Last time used it had trouble transitioning between small load and  larger load. Hesitation. I have just bought a B/S kit for carb.  I would like to know how to adjust voltage and the govermnor. Is there a regulator? Just installed new brushes.