Got the idle down. A fine dance between the idle screw, throttle linkage settings and low speed adjustment. However, we kept having stalling and we could not get it not to take off. However, while starting it, we noticed a noise that did not sound good. Took the motor off to see if something was broken and found the spring to the clutch shoes was broken in parts. Could this have been the problem all along? (Stalling, not getting the idle low enough).