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fc420v Problems

Discussion in 'Mechanic and Repair' started by Carey856, Jul 21, 2005.

  1. Carey856

    Carey856 LawnSite Member
    Messages: 2

    Hello (new guy here)

    I have a 48" Scag with the Kawasaki fc420v engine
    and im having a problem with keeping it running

    It will start up great when its sat overnight and runs really good until it gets up to operating tempature then it dies and will not restart until sitting for quite a while...4-5 hours

    I have already tried replacing spark plugs, and
    the main coil .......still exactly the same as it was

    any Ideas

    thanks alot
  2. Mowingman

    Mowingman LawnSite Platinum Member
    from Texas
    Messages: 4,717

    Yoy might be getting a vapor lock condition. Gravely and Kawasaki did a factory bullitin on the routing of the fuel line on some Gravely machines with the same symptoms. See if your fuel line is routed near areas that might get pretty hot.
  3. Carey856

    Carey856 LawnSite Member
    Messages: 2

    okay will do

    I forgot to add this I checked for spark after replacing coil

    when its at a cool temperature its showing spark

    when it gets to operating temp it looses its spark?????

    could the ignitor/ (thing bolted to the side of the engine) be the problem?????
  4. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    That would be the next step since the coil has been replaced.
  5. jeepman_in_mo

    jeepman_in_mo LawnSite Member
    Messages: 1

    I have a Scag walk behind with the Kawi fc420v engine. Mine is doing the exact same thing. I also replaced the coil. After i did it ran for about 15 mins and now it wont restart. i checked the kill switch wire to make sure it wasnt frayed. It's not.

    Any ideas fellas?
    thanks in advance, Wade
  6. Restrorob

    Restrorob LawnSite Fanatic
    Messages: 11,029

    Are you sure it's not sparking ? what did you set the coil to flywheel air gap at ? It should be 0.12 in. If so you may have a bad igniter also.
  7. barnard

    barnard LawnSite Senior Member
    Messages: 618

    Sounds like possibly valve clearance is too tight.Check valve clearances with engine cold.
  8. barnard

    barnard LawnSite Senior Member
    Messages: 618

    Did you ever find the problem?
  9. MBDiagMan

    MBDiagMan LawnSite Senior Member
    Messages: 852

    Since you have eliminate the coil it sounds to me like it is running too rich like a stuck choke or messed up float and needle/seat if that carburetor is equipped with one.

    Good luck,

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