Cruel Power and a bushing engine like the GP 61 are never going to get along in the long term. Put some castor oil in the fuel.

If they don't have castor oil at the hobby shop, get some at the drug store. About 4 oz in Cool Power or 2 oz in Omega.


Put the air bleed screw half way across the air hole. Run engine at wide open throttle and adjust high speed needle.

Then idle the engine and adjust the air bleed without touching the high speed needle.

These carbs are normally very trouble free