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20.5 hp Briggs vtwin surges, wont idle

skyman2112's Avatar

Join Date: Jun 2008
Posts: 1

06-30-08, 06:32 PM   #1  
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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cheese's Avatar
Forum Topic Moderator

Join Date: Jul 2001
Posts: 16,574

06-30-08, 07:55 PM   #2  
You'll need to take the carb off, open it up, and clean it well, blow out all passages, and reassemble.

"Who is John Galt?" - Ayn Rand (Atlas Shrugged)

God bless!

dkd41's Avatar

Join Date: Jul 2008
Posts: 5

07-14-08, 02:54 PM   #3  
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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