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Craftsman Tractor shuts down when warm

Discussion in 'Lawn Mowing' started by boomerjhett, Sep 25, 2009.

  1. boomerjhett

    boomerjhett LawnSite Member
    Messages: 1

    I'm new to the business and using an older Craftsman 42" riding tractor with a Briggs and Stratton 20hp engine, Model No. 917.270940, until I can afford a new mower. I can crank it when it's cold and it runs OK; misses every now and then, about once every 15-30 seconds. After about 3-4 minutes, it shuts down like you just turned it off. It will not crank at all after it has warmed up. I recently tuned it up with new spark plugs, air filter fuel filter and oil change. Can't find a manual for it online for troubleshooting. Any helpful info would be greatly appreciated. Thanks!
  2. Nosmo

    Nosmo LawnSite Bronze Member
    Messages: 1,216

    I'll be the first to make a guess -- sounds like it could be the coil.

  3. fastbs

    fastbs LawnSite Member
    Messages: 111

    after it shuts down and u turn the key to try to start it back up is the starter engaging and trying to spin the motor or are you getting nothing.
    If the starter isn't doing anything it could be the starter or relay between ignition switch and starter.
    If the starter is engaging and the motor is trying to turn over it could a weak starter or it could be a build up of compression not letting the starter spin it over that a valve adjustment would help. The temp change from cold to hot is sometimes enough make the valves expand and not open enough to release compression for start up. I had that on a 18.5 horse single cylinder B&S (it was junk) couldn't get the valves adjusted perfectly sometimes had to turn the key and spin the top of the motor with my hand to help it out.
  4. rm25x

    rm25x LawnSite Member
    Messages: 187

    Symptoms also would lead me to the coil. They get hot, and die. If it doesn't re-start hot but will after cooling down then its a 99% coil issue.

    MOHUSTLER LawnSite Bronze Member
    Messages: 1,376

    Deff sounds like the coil, Just advice, if your going to replace one. Replace the other. When one fails it overloads the second and it will soon fail also.
  6. fastbs

    fastbs LawnSite Member
    Messages: 111

    okay like the others are saying... if the engine is spinning over but not firing then coil. if the engine is not spinning see my earlier post.

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