Posted by joe csuti on November 07, 2012 at 13:52:52 from (70.111.202.28):
In Reply to: Any suggestions? posted by rrobert on November 07, 2012 at 07:26:10:
Two possible causes,1-main jet/hi-speed passages partially restricted due to dirt/gum & hi-speed supply too lean for eng when cold,after eng gets warm it will run on a leaner mixture.
2-carb iceing possibly caused by consensation buildup in venturi when eng at rest or a damp/wet paper filter element.When eng started any moisture in venturi/air filter is deposited on walls of venturi,due to design/shape of venturi this causes air to accelerate thru same,air also gets colder when it accelerates thru venturi causing any moisture in venturi/air to frost/freeze on venturi wall/hi-speed jet,after eng starts to warm up heat is transfered from block to carb body & prevents frosting/iceing.
I had this problem on a K301 on a tractor used with a snowblower,at temp 35 deg/below & high humidity carb would start to ice up,I cured problem by making a heated intake for carb,most small engs suffer fron this problem below 35 deg,this is why all walk behind snowblowers have heated carbs.
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