[RCW]

It is a wonder it even would start and idle, let along run at any speed other than wide open at 7.5 turns from the bottom. The carb has to be pretty plugged to allow it to even run at that setting.

Set it at 1.5 to 2 turns from lightly bottomed, after the carburetor is fully cleaned and the passages inspected. Then adjust from that point for the best sounding idle once you have it idling.

If you look up my posts you will find the procedure for power tuning the pilot jet air screw for maximum performance and economy.