The most probable cause is plugged/restricted idle passages in carb body due to dirt/gum.
Remove carb from eng,disassemble carb,remove hi/low speed needles,main jet nozzle(if removable)and remove any welch plugs in carb body(if used)soak carb body & all parts in carb cleaner overnight,run a fine wire thru ALL holes/passages in carb body & blow out with compressed air,if carb body has welch plugs & same were removed you'll probably have to buy a rebuild kit for carb,as plugs are usually damaged/destroyed removing them.
You might try a quick & dirty fix 1st before removing/dis-assembling carb,goto a local auto parts store/walmart & get a can of seafoam carb cleaner,add 1-2 oz to gas tank & 3-4 oz to gas container,run several tanks of gas thru eng & see if that cures problem,if not dis-assemble carb,clean & rebuild or replace carb.
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Today's Featured Article - Identifying Tractor Noises - by Curtis Von Fange. Listening To Your Tractor : Part 3 - In this series we are continuing to learn the fine art of listening to our tractor in hopes of keeping it running longer. One particularly important facet is to hear and identify the particular noises that our
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