Model #917388952 CRAFTSMAN Walk Behind Lawnmower, Gas

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Question and Answers

Q:

Craftsman mower is running slow 917388952 Craftsman Rotary mower

A:

Thanks for the inquiry and for being a valued member.

I am sorry to hear of the engine issue you are having with the mower. I know how frustrating that is to have happen.

I agree; it sounds like the carburetor is dirty, and it more than likely has a blocked or partially blocked fuel jet preventing a free flow of fuel. Fuel Stabilizer helps keep fuel fresh and does clean the carb, but it's more of a preventative maintenance measure rather than a fix. 

I would pull the carb from the engine. With a full can of carb cleaner, a wire brush, and a bread tie wire to poke through and clean the main jet; I would recommend a very thorough cleaning. Start by taking off the float bowl. Douse it very liberally with carb cleaner, and undo the pin for the float, and remove the needle and float. Clean them very thoroughly with the wire brush and carb cleaner. Pay close attention to the seat the needle sits in and clean it well. Once clean, start brushing the carb bowl and body and make sure you get all the varnish out. It may take three or four brushings with carb cleaner dousing in-between. From there, take the straw of the carb cleaner and shoot carb cleaner through any little hole or passageway of the carb. Shoot out the throat of the carb and poke the main jet with the bread tie wire. You have to make sure you get everything the first time, if you leave anything behind, it’s likely to reclog once you have it reassembled. 

I hope this helps and thanks for using SearsPartsDirect.com. We appreciate your business. 

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Jeff Wallace Sr -
Sears Technician
October 21, 2014
Q:

I need a new gas cap. 917388952 Craftsman Rotary mower

A:

Finding the correct part number for a gas cap should be a simple task. While you are waiting for an expert to respond, I have attached some helpful links below that may provide information to assist you with your question.

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Yadira B -
January 27, 2013
A:

Thank you for submitting your question. The gas cap information is going to be under the engine parts. The gas cap is part number 796577 priced at $10.10. You can order parts from our Sears Parts Direct web site. I hope this helps. Please reply back to this thread if you require further assistance. Thank you for using Manage My Life.

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Tykara -
Sears Technician
January 28, 2013
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Q:

My lawn mower is running very slow, and got even slower after adjusting the recently purchased spark plug to the correct gap.

A:

I am sorry that you are having some difficulties with your mower and I will be happy to help. I suggest you add the full model number of your mower and not the engine model number so that the expert can provide you with a more detailed answer. I did manage to find a link with a similar question. I hope this helps with your mower troubles while you wait for your expert response.

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Joseph P. -
September 12, 2012
A:

The mower is a Craftsman and it's model number is 917.388952. Thanks.

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Tom -
September 12, 2012
A:

More history on this lawn mower: My son had overfilled the engine with oil, so I drained all the oil and put new oil in it, took the muffler off and replaced it's gasket and replaced the spark plug. I also took the carb (which has no adjustment screws for fuel mixture or idle speed) off and cleaned it. Right now, to get it started, I have to keep priming it for a long time (backfiring the whole time) until it will finally stay on. Then it runs slow. It also backfires after I turn it off.

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Tom -
September 13, 2012
A:

Remove the spark plug and stand the mower up with the front facing straight down and see if anything drains out of the spark plug hole. Often when the oil is overfilled there is a good bit of oil that ends up in the head. When you try to run the engine it causes too much compression and running problems result.

Given how you've described things though, I have a feeling that the flywheel key has sheared and is causing the problems.

Thank you for using Manage My Life!

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Wade_B -
Sears Technician
September 13, 2012
A:

Thanks Wade. I turned it up like you said, after removing the spark plug. Held it there for a couple of minutes, but nothing came out of the head, however, I got a lot of gas out of the carberator. I did replace the shearing pin during all this, which, by the way, was almost all the way sheared off. Could I have messed something else up, while doing that, that may have caused the slow engine speed?

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Tom -
September 14, 2012
A:

It's not likely that anything was messed up. The key can shear sometimes from too much oil but that's usually all that will happen. Mainly because the machine just won't run or won't throttle up when it's overfilled to the point of being destructive. If the problem is still present then you may not have gotten the flywheel nut/bolt back on tight enough after the key was replaced. A loose flywheel nut will cause the key to shear again. A sheared key will cause all sorts of interesting problems with trying to get the engine to run or run properly.

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Wade_B -
Sears Technician
September 17, 2012
A:

You nailed it, Wade! Opened it back up and sure enough, the shearing pin was sheared off again. I must not have tightened the flywheel nut enough. Working great now! Thanks for your help.

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Tom -
September 19, 2012
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