backfire

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  #1  
Old 05-28-07, 03:39 PM
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backfire

My lawnmower has a 3 1/2 hp Briggs vertical pull.. Won't start on it's own, but will start if I take the aircleaner off & squirt gas into the carb..I put a new diaphram into the carb..after it starts, it'll run for under a minute,I adjust the needle to where it runs best.. then backfires & quits. It won't start on it's own after it quits, I have to reprime it again..
John
 
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Old 05-28-07, 07:49 PM
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Anyone, with a remedy??? would a partially sheared key do that, or is this purely a gas related problem??
 
  #3  
Old 05-29-07, 02:07 AM
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With a vertical pull starter, this tell me that it is older since these haven't been made since the mid- to late-eighties and with such you may have an engine that is just plain old, old. The first test I'd make is a compression test then an inline spark test and then go from there. Post back with the engine's model, type and code numbers as well as the results from the two suggested tests.
 
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