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Briggs 16 won't stay running unless choked?

This is a discussion on Briggs 16 won't stay running unless choked? within the Small Engines forums, part of the Tech Support Forum category. I have a Briggs and Stratton 16 horse on an older Montgomery Ward riding lawn mower. The engine won't stay


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Old 12-05-2007, 01:26 PM   #1
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I have a Briggs and Stratton 16 horse on an older Montgomery Ward riding lawn mower. The engine won't stay running unless the carb is choked a little. If I push the choke all the way in the engine will bog down and die. It runs ok with it choked a little, but lacks power and bogs down when put under load. It won't start either unless it is choked also, regardless of how long it has been running. I may have put some 92 octane gas in accidentally, would that have an effect on the performance? It does backfire after I shut it off now since I put in the 92 octane. Any ideas? I have a snowblower on the front and don't feel like shoveling, so please give me some ideas.

Thanks,
Adam

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Old 12-18-2007, 04:52 PM   #2
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It sounds like fuel starvation.
Have you tried changing the fuel filter?

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Old 12-19-2007, 09:50 AM   #3
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Like grumpygit said, I would check the filter first, then see what shape the carburetor is in. Check/change the spark plug also. Another possibility is a valve problem.
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Old 12-25-2007, 01:09 PM   #4
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Check fuel filter first, then next, check for a vacuum leak. It's running too lean, that's why you have to choke it a bit to run. Check the tightness of the carb. You might be sucking air between the carb and the intake.
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Old 01-02-2008, 08:24 AM   #5
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i go with what bronson7 said. but i have had this happen before i changed the air filter and changed the jet's unsless you can change them on this particular engine.
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Old 01-13-2009, 08:11 AM   #6
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I have had several Briggs engines that have had the same issue. With some of the engines that rely on a tight vacum seal to draw gas from the tank you need to make sure there are no cracks in the fuel cap. I have had people give me mowers that would only start once you put fuel in the carb and eventually die. The problem was a cracked fuel cap. Look over your cap and give it a shot.

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