Question about Craftsman 17.5 hp 42 in. Deck Lawn Tractor - CA Model

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Sears 19 hp twin 42 inch tractor, won't start if hot

I have a 10 year old sears 42 inch 19 hp twin Briggs Craftsman sears tractor. It will start fine if cold and run for hours, then I shut it off for a few minutes and it will not start again until cold, maybe one hour later. I rebuilt the carb, fuel pump, changed coil and 2 of the 3 interlock switches, ( clutch and blade switches). i believe I am not getting spark. Why does it work cold and then for hours then it won't start. It turns the engine over, fine just won't start running. ??????

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  • bigmike396 Nov 30, 2008

    I don't believe I changed the plugs yet. I did also change the Ignition key switch. When this problem occurs, I believe I am getting very little to no spark at the plugs on either plug. Again once the engine and tracotr sit for about 45 minutes it will start fine.

  • bigmike396 Dec 09, 2008

    I did actually change the Plugs when I did all the other items listed above, any ideas would be helpful.

  • Antonio Boscia
    Antonio Boscia May 11, 2010

    have you tried changing out the spark plugs?

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Hi
Two things come to mind. First it could be not getting enough fuel when hot due to carb adjustment being too lean. That could be that the float level in the carb is set too low or the low speed jet is set too lean. When cold the choke circuit in the carb supplies the extra fuel required.
Second in some enjines that have low compression they start cold but when hot the compression drops below 60 psi and makes starting very difficult until engine cools down.
I suspect a fuel problem.

Posted on Dec 31, 2008

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