I have a welder that starts and runs fine at idle but when placed in the" run" or "run/idle" mode, will not run at high idle. I have tried tightening the govenor spring. This didn't help. If I force the govenor lever toward the carburetor it will rev up, but push right back down to idle. This is a friends welder. He brought it to me to fix because he put a brand new carb on it and while doing so he caught some leaking fuel on fire and it charred a few wires. Upon inspection the wires weren't damaged but I can't get it to run at high idle as stated before. Is there anything electronic that might tell the engine to run at high idle, or is it only mechanically controled by the govenor spring?