[Shop-talk] B&S mower engine, surging and dying. Ideas?

[Bob Spidell]

I had a surging problem on an ExMark--really, a tarted-up 
Toro--zero-turn and they ended up replacing the engine due to worn rings 
(intake manifold was getting oiled-up).  Don't ask me why, but nothing 
else--carburetion, spark, etc.--made sense either. We're talking a 
rhythmic pulsing, and not sputtering, right?  Worn rings might make the 
engine's power ebb-and-flow, I suppose.

Bob

On 5/20/2019 8:48 PM, Scott Hall via Shop-talk wrote:
> This. Sounds like it's running just long enough to get a vacuum on the 
> fuel tank, then starving for gas. Then sitting until the tank reaches 
> atmospheric again. Then repeat.
>
> On Mon, May 20, 2019, 7:43 PM Pat Horne via Shop-talk 
> <shop-talk at autox.team.net <mailto:shop-talk at autox.team.net>> wrote:
>
>     Try leaving the fuel cap loose to see if that helps.
>
>     Will it start up when it dies with starting fluid.
>
>     Peace,
>     Pat
>
>     Pat Horne
>     We support Habitat for Humanity
>
>
>     On May 20, 2019, at 4:57 PM, David Hillman via Shop-talk
>     <shop-talk at autox.team.net <mailto:shop-talk at autox.team.net>> wrote:
>
>
>       Ok, I'm out of ideas.  Requesting new ones.
>
>       I have a Craftsman walk-behind mower with a 163cc Briggs &
>     Stratton 4-stroke engine ( engine: 104m02-0008-f1 to be precise
>     ).  It's only 3 or 4 years old, but it will not run.  And it's
>     starting to piss me off.
>
>       It starts normally ( no manual prime or choke, so it takes ~3
>     pulls but it always has ), and runs fine for less than 5 minutes. 
>     After that, it surges rhythmically and after a minute or so of
>     that, dies.  Following that, it will not re-start until allowed to
>     rest for a few minutes.
>
>       I have installed a new plug, new air filter, new carburetor, and
>     new ignitor.  I checked and set the gap on the plug and the
>     ignitor to spec ( .030" and .006-.014" respectively ).  Has clean
>     oil, and brand new gas. Fuel screen in the tank is clean, as is
>     the fuel hose to the carb. Carb bowl has fuel.
>
>       What else can be wrong with it?  It seems to be heat-related,
>     but it has no cooling system.
>
>       Thanks.
>
>     Obligatory Shop Content: I can't work on anything interesting
>     until this damn mower runs.
>
>
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