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I'm assuming you have the duplex carb on a gasoline (not all-fuel) engine. These are pretty simple things and don't need a whole lot of tweaking. If it truly is flooding, the float in the carb bowl may be sticking open and dumping gas into the cylinders. It may be starving for air. Check to make sure the choke plates are open and the air intake passage is clear. However, the backfiring leads me to think you have an ignition problem. Verify the points in the distributor are breaking at 5 degrees ATC on the flywheel side cylinder on the compression stroke. After I put my 50 back together, I failed to fine time it and it didn't run at all. The ignition was retarded an extra 5 degrees ATC. You may also want to try new spark plugs. I use AC C87 plugs in mine and I've seen others on this site recommend AC C88 although the local auto parts store didn't carry those when I asked. Regarding the hot pulley, the clutch facings are generating the heat. The clutch lever is moving too far back before the pulley brake can make contact with the pulley and stop the actuation of the clutch. When you pull the clutch lever back, the clutch facings are actually re-engaging against the backside of the neighboring clutch plates. Adjust the pulley brake so the clutch lever doesn't move so far back when disengaged. I'm guessing that, with the tractor in gear, you can tell the engine is laoding up a bit when you pull the clutch lever back with a little force. Mine was that way when I got it and a little adjustment of the pulley brake fixed it right up. NOTE TO ALL HAND CLUTCH USERS:
Keep the clutch engaged as much as possible when the engine is running -- even in neutral. This minimizes the wear on the facings and maximizes the life of your clutch. Disengage the clutch just long enough to put it in gear or take it out of gear.
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