backfirin Briggs

ghost1

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I have a BS Intek 344cc 12.5hp (219907 0131 B1) that was allowing gas past the carb to the sump. I attempted to get the needle to seat with no luck so I purchased an aftermarket carb. After installation, engine surged and backfired, which it didn't do with original carb. I removed float assembly from new carb and installed on original but engine still backfires. Can anyone offer any advise? Thanks
 
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Which carb do you have ???

Walbro or Nikki ??? The Nikki is the carb with the plastic and the noodle gasket as we call it....

The Walbro has a regular round gasket for the bowl......

Backfiring can be caused by 3 things....

1st thing valves
2nd thing bad valve guide
3rd thing head gasket and that just might be your culprit for the gas passing thru..........

Let us know Mon Ami ~!~!
 

ghost1

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Embarrassed to say I had put the main jet upside down when reassembled. Thanks for taking the time to reply.....
 

shiftsuper175607

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Embarrassed to say I had put the main jet upside down when reassembled. Thanks for taking the time to reply.....

Are you saying: "It is running great now on the replacement carburetor...after I turned the needle over...problem solved.


This is so anyone with a similar problem and reads your thread might be helped.
 
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