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Kawfc420v will not restart when hot

Discussion in 'Mechanic and Repair' started by scagboy, Jul 28, 2005.

  1. scagboy

    scagboy LawnSite Member
    Posts: 1

    Mower starts when cold but will not restart when hot. No problems for the first 300 to 400 hours on engine (this was a replacement 420) on a scag SWZ, we have switched stater and coil off the original engine that had a bad crank, still have same problem, starts when cold-wont restart hot & if left idling it will stall. We have fiddled with all the safteys on the mower and dosent seem to be that. We even added the square piece to the side ( some call it the ignitor)The new replacement engine did not have this piece, but either way-same results. Engine will start dead cold but will not restart until it has cooled for quite a while. A real nightmare out on the job. Appreciate any helpful advice. Mower repair shops in our area are NOT an option. They are expensive ($65.00 an hour) and our mechanic is generally more experienced.
  2. Lawn Masters

    Lawn Masters LawnSite Senior Member
    Posts: 850

    is the spark plug(s) tight? that might be the problem.
  3. Restrorob

    Restrorob LawnSite Fanatic
    Posts: 11,023

    Have you checked the valves ? They should be checked and adjusted every 300 hours, If not they should be set at 0.006 both intake and exhaust.

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