20.5 hp Briggs vtwin surges, wont idle


Old 06-30-08, 06:32 PM
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20.5 hp Briggs vtwin surges, wont idle

Hey there, i suddenly had a problem after mowing last week the engine keeps hunting up and down and dies when i try to idle. It runs ok when i put the choke 1/2 on but starts surging when i turn it off. Must of got something in the carb so i tried some carb cleaner and ran it 20 minutes but no change. Thanks for the advice.
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Old 06-30-08, 07:55 PM
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You'll need to take the carb off, open it up, and clean it well, blow out all passages, and reassemble.
Old 07-14-08, 02:54 PM
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I had the same problem with my 20.5 Briggs last summer. If you have'nt taken the carb. off yet, try some Sta-bil fuel stabilizer mixed 50% richer in your tank. It smoothed mine out in about ten minutes running time. Good luck.
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