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18.5 hp 42 inch cut, craftsman riding mower loses power after 10 min.

I have been working on this mower for about a month, have had many helpful replys, but; problem still there. It runs great for 10 min then starts losing power, almost quits, then comes back up again in power, after a few minutes the same thing happens again, over and over again. Finally will quit. I have cleaned the air filter, put in a new plug set at .30, removed the coil (armature-magneto) cleaned it, and reset at 13 thousands- a business card length away from the fly wheel, changed oil and filter, removed carb and flushed with carb cleaner, renewed gas lines and filter, removed gas tank- flushed and cleaned, cleaned gas cap and checked the gap in the top it is open and clean. when it quit I checked the plug to see if I was still getting sparks I was and plenty. I know the problem is either in the firing or the fuel, but; I am running out of ideas... need more help folks. Don. crimson9

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  • 7 more comments 
  • Don Carroll Aug 09, 2012

    I meant the thickness of a business card tight against the fly wheel and coil. Not length.

  • stevenschulz Aug 10, 2012

    I too am having the same problem. My B/S will run for about 5 minutes then cut out. I have tried to clean the carburator, I checked the fuel pump, which is pumping fine, and also checked the anti backfire silanoid which seems to be functioning. Im not sure what step to take next?

  • Don Carroll Aug 10, 2012

    I am working on the choke right now on mine. with it running I can move the choke by hand and it settles out. But, don't really have a lot of knowledge on chokes.

  • Don Carroll Aug 10, 2012

    gas line filter is in correctly.

  • Don Carroll Aug 11, 2012

    please read what I have already done before replying. Thanks.

  • Don Carroll Aug 11, 2012

    I need help in freeing up the choke, it is not moving freely, and I have no knowledge on how to fIx the choke, anyone can help me there?????

  • Don Carroll Aug 12, 2012

    I figured it out, took the choke apart and replaced the spring, runs fine.

  • Don Carroll Aug 12, 2012

    problems fixed. thank everyone for the many ideas you gave me to track it down.

  • Dennis Key
    Dennis Key Aug 14, 2012

    Glad you found it.



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Us start here, remove fuel line from carb. Hope fuel runs out.
Check the direction of fuel filter. There arrows on it. Arrow toward

Posted on Aug 10, 2012

  • 1 more comment 
  • Don Carroll Aug 10, 2012

    fuel filter is in correctly

  • Don Carroll Aug 12, 2012

    fuel filter was o.k. , but thanks for the input anyway, I found problem and repaired it, the problem was a broke sprink in the choke.

  • Don Carroll Aug 14, 2012

    thank you Dennis, you are the only one, so far; who actually read my who script, and problem details. That is professionalism. If I can ever help you, I am here. I don't know how they rate people, really don't care, but; I am 70 years old and have some knowledge, a little bit, about everthing, and am willing to share.



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Posted on Jan 02, 2017



  • 33 Answers

SOURCE: Motor runs for 5-10 min. then starts missing and quits.

Check your spark first,if you do not have spark your problem is the coils-if you do have spark the problem probaly lies withone of your valves getting stuck after getting hot and soonas it cools down a little it closes and then you can restart it till it gets hot again.Hope this helps

Posted on Jul 04, 2009

Robert J Gordon

  • 11 Answers

SOURCE: I have a Craftsman 42 in. 15.5 hp lawn tractor

check an see if the cabuerator is getting fuel and check make sure sparkplug is getting continous fire from the coil

Posted on Sep 13, 2010

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