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Do you have a Briggs or kohler engine.I am having the same problem.I have changed the fuel filte, fuel pump, and cleaned the carb.Sears has been no help at all.The reason I ask about the engine you have is that people are having the same problem no matter what engine they have.So therefore it probably is not the engine so it is something else on the mower.My mower runs fine for about 10-15 then starts to stutter and backfire.I am continuing to pursue this problem and I will post back here if I come up with anything.
Replace the battery. Even though the battery may say it's good, it doesn't have enough of cranking amps. Go purchase a battery with 350 cranking amps. This will fix your problem. The battery power isn't enough to kick the starter completely up to turn the engine.
Do you have spark? There are two things to look for when any engine won't start....fuel & spark, Take your plug out and lean it up against the metal of engine...turn it over and see if you see a good blueish spark.
No spark? Could be the plug, safety switch, coil
Next squirt a little gas into spark plug hole, replace the plug...will it fire up? If so...start working your way back down the fuel system....carburetor, fuel lines, fuel filter and gas (is gas old or new? is there any water in it?)
The snowblower attachment manual is available in the manufacturers' website. If not, go to the Murray website. They manufactured these tractors for Sears. You may find the manual there.
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