20 hp Briggs Backfires and stalls under load


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Old 06-16-11, 10:43 AM
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20 hp Briggs Backfires and stalls under load

I have a 20 hp briggs that just began backfiring when I started it. Once started it ran fine. Now it has begun to backfire and stall when under a load. If I disengage the mower it runs fine, but when I put it back under a load it will backfire and stall. Any ideas?
 
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Old 06-16-11, 07:54 PM
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Sounds like water or trash in the carb.
 
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Old 06-17-11, 10:48 AM
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Thanks. I'll check that.

BTW, yesterday I went out and started it and it ran fine. I engaged the mower and it ran just like it was supposed to. I mowed about 30 minutes and never had a problem. When I took it back to the barn and throttled down to park it, it backfired a couple of times.

Also, one of the valve covers is oily. The other is very clean.
 
 

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