They are both gas. Idle and power mixture. Idle will accept a small screw driver, power is at the base with a cross bar or a hole if the cross bar fell out.
Drain the bowl by removing the plug at the bowl base, I seem to remember it is a 7/16. You don't want to be fighting a bowl of snot and water.
Tune the idle first, max speed or highest vacuum. Power is best done at load, belt work, generator, dyno, tune for peak power then detune rich 1 HP. You don't want to be lean, you will burn a valve. Don't ask me how I know.
A stumble from idle to power on the throttle indicates a lean condition.
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Today's Featured Article - Grain Threshing in the Early 40's - by Jerry D. Coleman. How many of you can sit there and say that you have plowed with a mule? Well I would say not many, but maybe a few. This story is about the day my Grandfather Brown (true name) decided along with my parents to purchase a new Ford tractor. It wasn't really new except to us. The year was about 1967 and my father found a good used Ford 601 tractor to use on the farm instead of "Bob", our old mule. Now my grandfather had had this mule since the mid 40's and he was getting some age on him. S
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