If all else fails try this simple procedure. This is for the Tecumseh Snowking snowblower engine with a fixed air mixture screw.
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Idle Restrictor Screw #640027
Buy Part here: http://www.repairclinic.com/PartDetail/Nozzle/640027/1659232?ss=-x363430303237&mr=0?RCAID=1000076
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