Since you were so helpful with the brake job I thought I would ask about my revving problem. At idle the motor revs up and down. When I engage the mower then it is fine, disengage then it starts again. I tried adjusting the air fuel mixture to no avail and put it back where it was to start. Any ideas or suggestions. The gas is only 2 weeks old and I put some Lucas fuel treatment in the tank a month ago, just a little bit to clean up the carb.
Thanks again in advance.