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OrangeBrian
My tractor runs for a minute or two, then it pulses and then shuts off. Any ideas to what is wrong?
I have a craftsman tractor (17.5 hp ohv, briggs & stratton) which has run fine for a few years now. Just recently though, around the fall season, it stopped working while I was mowing. It still doesn't work right after changing the oil, the air filter, the gas line filter, and the spark plug. To describe the problem, it starts up, runs for a few minutes, then it starts pulsing (sounding almost like the throttle is being pushed down and back up over and over again), then it shuts off. I tried everything I could think of to get it working. Any other ideas to how I could possibly get this working? I am not a mechanic nor am I real great with engines, so I really appreciate any help.
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Jockamo:

When the mower shuts off you need to immediately check for spark. I'm guessing you won't have any.
If you don't have spark you need a coil, common problem.
If you have spark things gets a lot more complicated. Test for spark, if you have spark post a follow up. I'm 99% sure we don't need to go into the 500 word essay on what else could be wrong.

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Born Fool:

Sounds like old fuel problem. Try a fresh batch of fuel. If that fixes the tractor, then drain your fuel storage and add fuel stabilizer to your storage tank next time.

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Mac....Of Moot and Mac:

Does it always crank?...If so, it may be a fuel mixture problem...Not enough air/gas ratio, causing it to quit. Clean out carbuerator...check all vacuum points.

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?SugarBabe:

Perhaps your bib overalls are caught in the drive unit.

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