Have you experimented with the air cleaner by lifting it on and off running?
Does it change solely by the presence of the cleaner, or the screws holding it?
Will cupping your hand around the carb do the same thing?
Sounds like possibly a defective carb. Will the original carb work at all?
Compare the original with the new. It will take a very close comparison, checking drilled ports, air bleeds, etc. Sounds like maybe something is wrong with the choke circuit. Or it is picking up slight atmospheric differences due to possibly a bowl vent issue. Especially if it turns rich when the cleaner is on.
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Today's Featured Article - Women and Tractors - Tractor Engine Repair - by Teri Burkholder. One of the great things about working on a tractor engine with your other half is that you know what he is thinking of at all times and can anticipate his every move and his next thought of what he will do. With Ben, anyway, I can tell! He'll be busy working and I�m handing him tools and he says, "give me that..." and I�ve already got it in his hand or "hand me that....."and I�ve got the portable light right where he needed it placed to see. "Run in the house and get me a...."as I open th
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