Question about Craftsman 42 in. Deck 19.5hp Lawn Tractor

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I have a craftsman 19.5 hp lawn tractor model # 917.271825 and the engine idles up and down constantly I ahve changed the air and fuel filter but it still is doing it. What should i check?

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Carb is dirty and leaning out so the governor throttles the engine up & down causing a surge. You can try using a good quality fuel injector cleaner product mixed in the gas. That may help but if that doesn't work it will be best to replace the carb. That is an older engine and the carb is not likely fixable. It is a matter of how much money you want to throw at it. Putting a carb kit in it and giving it a through cleaning has no guarantees then you will still need to spend money on a new carb. The carb for that runs about $165. If you replace it yourself I'd recommend taking pictures as you take it apart so you can see where all the linkages go and you will be able to put it back together without problem. Hope this helps. Please vote yes if you find it helpful.

Posted on Nov 18, 2010

  • mblegg Feb 24, 2011

    I have the same mower , I put a carb rebuild kit on my carb for about $20.00 bought it at a local hardware store done the work myself it is fairly simple to do only thing to remember is to clean the carb thoroughly cleaning all port holes, on a scale of 1 to10 , 1 being the easiest Iwould rate this job a #3 Iran my mower all season last year with no problems whatsoever!!

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