Lawn tractor with Briggs & Stratton engine


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Old 04-25-16, 07:03 AM
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Lawn tractor with Briggs & Stratton engine

We've got a 12 yr. old Riding mower, that starts fine, and runs fine for approximately 15 minutes and then the engine starts lugging and finally cuts out completely. It doesn't seem to matter how fast or how slowly the engine is running same thing happens - once it cuts out, it will not restart for at least 5 minutes, and then the same thing happens all over again. Had a complete tune up a year ago, and ran fine for a couple of months and then this started again. Any thoughts?
 
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Old 04-25-16, 07:17 AM
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I would suspect the coil, ignition module, or whatever they call it on that engine. When it quits, check to see if you have spark; that should point you toward either an ignition or fuel problem. For a few bucks, you can buy a tester that clamps onto the engine and that your spark plug wire connects to at your local auto parts store. Or you can just use another spark plug if you have one lying around.
 
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Old 04-25-16, 07:19 AM
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Kind of sounds like the carb may be leaking and slowly flooding the engine, hence the 5 min or so restart time
 
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Old 04-25-16, 07:32 AM
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Try loosening the gas cap when the engine starts to lug.
 
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Old 04-25-16, 07:40 AM
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I'm intrigued, what will loosening the gas cap do?
 
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Old 04-25-16, 07:53 AM
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The cap has to vent; otherwise it creates a vacuum in the tank, shutting off the fuel flow. Not at all uncommon of a problem.
 
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Old 04-25-16, 07:54 AM
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It will relieve the vacuum which may have been created by a blocked gas tank vent.
 
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Old 04-25-16, 12:47 PM
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Knowing my B&S, I second Imsoboard - leaking carb. Floods engine, then takes time to evaporate. But mine will have hard time starting for same reason. I installed fuel cut off and shut fuel flow when I turn it off.
 
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Old 04-25-16, 04:28 PM
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I would say check the fuel cap trick first and then the mag/coil...

A leaking carb is not likely to cause this issue since it would cause it to run rich if anything. Also a fuel valve is barely a bandaid and not a fix. The engine will not use the amount of fuel that is supplied to the carb, so if the carb is not shutting off fuel to the engine, there is excess fuel that does not evaporate, it mixes with and delutes the oil shortening engine life considerably.
 
 

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