Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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Craftsman riding lawn mower tries to start and just putters then it backfires and shuts down.

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It sounds like its the exhaust is blocked up or/and air filter, its the back fire that makes me think its a blocked exhaust,, iv had it before!
try taking it off and starting it up,,,,and yes its going to be noisy if it go's! untill you clean out the pipe, then put it back on again,

Posted on Nov 16, 2009

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Craftsman lawn tractor


Backfires are caused by unburned fuel, after you shut off the mower, and you try to restart it, if you have any leaks, it will push any unburnt fuel towards the muffler, and that will ignite once it gets in a hot muffler. First try starting it at 1/4 to 1/2 throttle. I also suggest you try shutting down the motor at 1/4 to 1/2 throttle.

What this problem usually means is you need to rebuild your carburetor, with this poor quality ethanol fuel they force us to use these days, it will eat up your gaskets and rubber seals inside your carb.

What I found that helped me with my mower, was using non-ethanol gas. Its hard to find and is usually expensive, but that solved most of the problems I was having with my 10 year old craftsman mower, which has the 17.5 kohler motor.

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clean the jets inside the carb

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first smell the oil is there a gas smell to it?the needle valve maybe dripping fuel and over flowing into the intake

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sounds more like the carb sucked up something if u take it off and tear it down let soak in solvent than blow air thru body to dry and clear passages dont mess with adj

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Backfiring is a sign of too rich on gas and not enough air. Not enough gas will cause the mower to bog down when blades are engaged as it isn't powerful enough to run the motor AND turn the blades. Check your carb and see if you need to clean it and replace diaphgram. Sounds a lot like a carb problem.

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