Models: Drive-units, DU53, DU53H, DU53BF, DU53HBF, DU47YD, DU47YDE, DU10YDE
On occasions, if the engine speed has been set to a fairly low (no load) level ie. under 2800rpm (Sometimes done for Flexible Pump and Vibe Shaft Drive Units), this can cause excessive vibration under load and result to damage to the muffler. A smoother performance will be achieved by setting the speed to between 3000 to 3400rpm for extended periods of use.
