Larry: Thanks so much for your help! I now have the machine running again, but it now it's running at super-high revs and I can't seem to get them down. I've tried adjusting 3 things: The rich/lean control on the top of the propane/air mixer, the huge screw on the side of the mixer which cuts off airflow from the hole inside, and I tried adjusting the position the linkage to the pedal holds on the shaft that runs through the carburetor/mixer (and thus positions the butterfly flap inside). All efforts came up with no change. I need advice from a guy like you with experience! Thanks again Larry.