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 - Choosin, Mounting and Using a Bush Hog Type Mower - by Francis Robinson. Looking around at my new neighbors, most of whom are city raised and have recently acquired their first mini-farms of five to fifteen acres and also from reading questions ask at various discussion sites on the web it is frighteningly apparent that a great many guys (and a few gals) are learning by trial and error and mostly error how to use a very dangerous piece of farm equipment. It is also very apparent that these folks are getting a lot of very poor and often very dangerous advice fro
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