engine only runs with choke on

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  #1  
Old 03-25-09, 01:44 PM
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engine only runs with choke on

I have a briggs mod. 110412 ohv engine with a briggs carb. It was only running with the choke on so I cleaned the carb and replace the needle and seat(it has a plastic float) replaced the welch plugs. It still only runs with the choke on. It is on a troybilt tiller. I removed the carb and cleaned it again still same thing. What is the problem? Thanks for your help
 
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  #2  
Old 03-25-09, 01:55 PM
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did you install a new spark plug? also, check the gas cap vent.
 
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Old 03-25-09, 02:15 PM
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I put in a new plug and will check gas cap. thanks
 
  #4  
Old 03-25-09, 02:52 PM
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I checked the gas cap. took it off and still same problem. when I try to move it off choke it starts to surge real bad.
 
  #5  
Old 03-25-09, 04:20 PM
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I would suggest cleaning the nut that holds the bowl on(main jet), there are two holes close to the bottom and one through the center, also while it is running spray carb cleaner along the mating surfaces behind the carb and intake, if the engine tempo changes you have an air leak. Have a good one. Geo
 
  #6  
Old 03-25-09, 06:03 PM
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thanks Geo will try that tomorrow.
 
  #7  
Old 03-26-09, 06:24 PM
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I cleaned the main jet again and that did it. Runs great. thanks for help
 
  #8  
Old 03-26-09, 06:36 PM
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Success is a wonderful sound. Have a good one. Geo
 
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