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I have a Generac 66G. It along with two 12000 BTU ac's were removed from same motor home and placed in a bus. When both 30 amp breakers on the control panel are set to on the engine has a tendency to lope. Has anyone had this problem. Would adjusting the RPM screw help with this.
Are you saying the speed changes from higher rpms to a lower rpms and back up to the higher rpm.If so it maybe running to lean.My Onan was doing this and a touch of adjustment on the mixture screw smoothed it out.If you try this mark the setting so you can turn back to the prior setting if it does not help. Good Luck Mike