Tecumseh's are notorious for having bad carbs. I have tried many a times to clean those idle circuits with no success. The only thing that I have been able to do is replace it. They make a carb with a manual choke. It will run you roughly about $80 but it is worth every penny just to get rid of that crappy primer bulb.
For the grinding noise, is the little bronze/copper looking bushing in place on the front part of the clutch (variator)?
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