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How do I speed up the idle on my Craftsman lawn mower

I have a craftsman push from behind lawn mower, It's only 2 1/2 years old. I bought it brand new from Sears and the warranty just ran out. The model number is 91738844. When I start the mower up, it just barely starts and will stay at a very low idle. It is impossible to cut the grass at this idle. I have already emptied the gas tank and replaced it with fresh high octane gas and the air cleaner is completely clean. There is a black plastic piece that holds the throttle door completely closed, I would hold it in the closed positon and the idle would pick up to about almost where it should be, but I can't hold this plastic piece and mow the lawn at the same time. Something is going on with the carburetor, do I have a spring missing, how do I turn up the idle. I think its something simple and the Sears service center wants $105 to fix it. I paid some where around $200 for the lawn mower 2 years ago. Please help if you can-Thank you

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Craftsman , Lawn Mowers
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13 Answers from these members:
Robert Pawelek
Please provide these images for this same posted topic. They are unavailable to me...
by Robert Pawelek
May 10th
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Mark T
I will be happy to assist you. I posted an image below that shows how to adjust the engine speed. Click in the image to enlarge it. The throttle spring connects to a fixed tab. When you bend the tab, the engine speed will change. If you are going to adjust the engine speed, I recommend using a tachometer and setting the engine at 3250 RPM.





I hope this is helpful. Please let me know if you need further assistance.






Thank you,
Mark T.
by Mark T Earned 1,607 community points in Craftsman
September 15th, 2012
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Manage My Life
I have the same problem (low idle) on model # 917.388571

How do I adjust the idle higher?

Thanks.
by Manage My Life
September 14th, 2012
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Mark T
Chris,






I am glad to hear you have the mower up and running. Please let me know if you have any other problems with the mower.





Thank you for using Manage My Life!

Mark T.
by Mark T Earned 1,607 community points in Craftsman
September 1st, 2012
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Manage My Life
Actually the spring itself was gone. :) I replaced it. Thanks Mark!
by Manage My Life
August 30th, 2012
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Mark T
Chris,






I posted an image below that shows your model without the air filter. To speed the engine up you have to bend the tab that the spring is attached too. Bend the tab toward the front of the engine to speed it up. I recommend using a tachometer when you adjust the engine speed.






I hope this is helpful. Please let me know if you need further assistance.







Thank you for using Manage my life.
Mark
by Mark T Earned 1,607 community points in Craftsman
August 27th, 2012
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Manage My Life
Hi Mark - exact same problem, different model: 917385320. Advice?
by Manage My Life
August 26th, 2012
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Mark T
Don,






I will be happy to assist you. I posted an image below that shows how the link should be connected. The image also shows how to adjust the engine speed. Click on the image to enlarge it. To adjust the speed on this model you just bend the tab the governor spring it attached to. Be sure to use a tachometer to verify the engine speed. It should be set to around 3200 rpm.




Please let me know if you need further assistance.



Mark T.
by Mark T Earned 1,607 community points in Craftsman
August 19th, 2012
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Manage My Life
Mark, I know this is a late reply to the original post.. but I have the same problem with idle speed. The model number is 917.388300.
by Manage My Life
August 15th, 2012
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Mark T
I have posted an image below that shows how the cable is connected to most of our mowers. If this image does not match your mower please reply below with a model number and I will see what I can do.
by Mark T Earned 1,607 community points in Craftsman
August 10th, 2011
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Manage My Life
exactly the area that i am checking. however, the operator presence control bar does not appear to be connected to the arm bar under the tank. do you have a diagram of the cable from the operator presence control bar(on the mower handle) down to the arm bar?
by Manage My Life
August 9th, 2011
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Mark T
Thank you for your question.

I am sorry you are having a problem with the mower. If the mover is not coming up to speed, I recommend checking the linkage first. The first image below shows all of the linkage. Make sure it all moves freely. If it is fine and the spring is connected click on the second image. This image shows how to adjust the engine speed. The rpms should not me set higher than 3250.

Please let me know if you need further assistance.

Here is a link to order any parts you need.

Sears Parts Direct

.

If you do not feel confident repairing this problem yourself, then you can have it repaired by a Sears technician. Here is a link that will provide the nearest drop-off locations:

Sears Home Services

.

Thank you for using Manage my life.

Mark T.
by Mark T Earned 1,607 community points in Craftsman
May 26th, 2011
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Manage My Life
I understand how important it is to have your equipment working properly, especially when the grass needs to be cut. While you are waiting for your expert answer, I have found a link that will provide some information and instruction for the idle speed. I would suggest that you look at the parts diagram on searspartsdirect.com to see if there is a missing part. I hope that this will help you.
by Manage My Life
May 24th, 2011
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