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Briggs and Stratton won't start

Discussion in 'Mechanic and Repair' started by hess, Mar 7, 2007.

  1. hess

    hess LawnSite Member
    Posts: 208

    I need help from the big boys. I have a 6.5 hp Briggs motor when you start it up cold it will start right up. when you run it for 30 min or longer and shut it off it won't start. But when you let it cool down it will start right up. Its been in thge shop 6x they checked the valves , new carburator and said they went through it they even had a briggs rep down for this. know today it did the same thing. It seems somthing to do with it getting warm and won't start. Any ideas? Its in the shop today it's in it's new home.:dizzy: *trucewhiteflag*
  2. MuleCutter

    MuleCutter LawnSite Member
    Posts: 212

    coil seems to be the problem. when you get that changed just make sure you have a fresh spark plug to go with it.
  3. HK45Mark23

    HK45Mark23 LawnSite Member
    Posts: 200

    I have had the same prblem. Don't like them any way. Try a Kawasaki next time.
  4. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    MuleCutter is right, It sounds like the coil. They need to check for spark while the engine is hot and won't start.
  5. Jay74

    Jay74 LawnSite Member
    Posts: 57

    Sounds like vapor lock. Check fuel hose routing or any heat shields that might be missing.
  6. hess

    hess LawnSite Member
    Posts: 208

  7. newz7151

    newz7151 LawnSite Silver Member
    from Tejas
    Posts: 2,419

    Either gas cap not venting, loosen it. Or coil getting hot and faulting internal. Replace one or both. Start with the gas cap, cheaper.

    Kind of hard to diagnose without actually having it on hand.
  8. dutch1

    dutch1 LawnSite Silver Member
    from Jayhawk
    Posts: 2,231

    We still have gotten any feedback on whether or not you have spark after he unit shuts down. As a lawn service professional, investing in an inline spark checker would be mandatory. Hook one end to the spark plug and the other to the plug wire. Start the engine and let it run, in the sun if possible, watching the checker for intermittent or no spark condition. If the unit dies with no spark and there is no spark when attempting to restart you likely have a coil that is breaking down under heat. Another condition to check is the kill wire running from the coil to the zone kill switch. Check for any bare spots in that wire as it runs under the cross over tube and over the engine back to the zone kill. You may have a bare wire that is expanding due to the heat, thus pushing it into a grounded condition. Not likely but a possibility. Additionally, as already indicated, check for a non venting fuel cap if the unit still has spark when dying and upon on attempted restart.

  9. DiyDave

    DiyDave LawnSite Bronze Member
    Posts: 1,695

    Ditto on dutch1's comment-most of the time I have run into ignition problems on small engines its the $3 spark plug that's bad.
  10. hess

    hess LawnSite Member
    Posts: 208

    i tried that two samething happens! :confused: Just got it back again briggs don't know what to do:cry:

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