Model #143986700 CRAFTSMAN Engine

  • Replacement Parts
    3 Results
  • Starter 590739 Div 71/143
    3 Results
  • Carburetor 640020 (71/143)
    3 Results
  • Rewind Starter
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Question and Answers

Q:

Lawnmower help 917377591 Craftsman Rotary mower

A:

Thank you for choosing SearsPartsDirect.com and for contacting us with your question about your Craftsman rotary lawn mower model 917.377591. I am so sorry it will not stay running after having sat for a long time.  I will be happy to help you with this. 

Based on the details you provided, it does sound like there is a problem with the carburetor. This can happen if the product sat for a long time with fuel in it. Fuel breaks down very quickly and becomes thick enough to clog the fuel lines and the openings in the carburetor. The fuel system parts are all listed under the engine model number (for your mower the engine number is 143986700). I have included the link to the engine diagrams in case you need other parts, such as the fuel lines, to complete your repair. 

The carburetor repair kit is part number 730637A. You may find it easier to replace the carburetor. That part number is 640020. Both are available on our SearsPartsDirect.com website. 

SAFETY WARNING: Make sure to follow the safety precautions in your owner’s manual when repairing the mower. Parts may have sharp edges. Use caution and wear work gloves. If you would prefer to have a technician complete the repair for you, you can set up service at www.SearsHomeServices.com or by calling 1-800-469-4663.

I hope this answers your question. Thank you for choosing Sears, we appreciate your business. 

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Rachel Morgan -
Sears Technician
August 19, 2015
Q:

Idles to fast 143986700 Craftsman Engine

A:

Thanks for the inquiry and for being a valued member.

This Craftsman engine made by Tecumseh is equivalent to Tecumseh's VLV66 engine model. For convenience, I have linked the engine specific service manual below that covers the idle speed control and adjustment on page 14. 

Service Manual

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

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Jeff Wallace Sr -
Sears Technician
July 30, 2015
Q:

Can't keep the mower running 143986700 Craftsman Engine

A:

my guess is there is a small hole in the bulb, what are you referring to as in the bulb staying in? it should set behind a bracket.

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Brian -
May 05, 2015
A:

Thanks for the inquiry and for being a valued member.

I am sorry to hear of the issue you’re having with the engine. I know how frustrating that is.

It sounds like you have a dirty carburetor that needs to be cleaned. You probably have a plugged main jet or sticking needle. 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. 

In regards to the primer, there is a retaining ring that holds it into place. It could be that the ring is damaged. I have posted a short video below that will show you how to reinstall this type of primer. The setup is a little different, but the same principle would apply.

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

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Jeff Wallace Sr -
Sears Technician
May 06, 2015
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