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slowing throttle without stalling?

John Deere (1986?) 4.5 hp ohv when you pull the throttle back to slow engine it stalls. What needs adjusted or replaced?
Tina, September 2009
Either set the pilot mixture screw to 1 turn out, or adjust the fast idle screw that controls the tickover speed. If neither of these have any effect, the carburettor needs to be stripped and cleaned.

John, September 2009