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Engine Won't Idle

Discussion in 'Mechanic and Repair' started by JDD, Sep 21, 2001.

  1. JDD

    JDD LawnSite Member
    Messages: 2

    6 h.p. Robin engine on Snapper commercial mower starts ok and will run all day at high rpm's. It will not idle - ever. It is also a little hard to start when it has been running for a while. Gas, plug, and air filter are ok. Someone said it might be a problem with the coil. Any thoughts? Thanks.
  2. Robert Doubrava

    Robert Doubrava LawnSite Senior Member
    Messages: 342

    like they said, it may be an electrical problem. check the coil and spark plug wire.
  3. m.o.p.e.

    m.o.p.e. LawnSite Member
    Messages: 1

    Try cleaning your fuel system (tank, filter, line). Then have your carburetor professionaly cleaned. I have found that the Japanese engines tend to be more sensitive to small particals in the fuel system. Coils usually work or don't work.
  4. khouse

    khouse LawnSite Bronze Member
    Messages: 1,465

    If it runs fine at high rpm's then the coil is fine. There isn't a fuel delivery problem either since cutting grass at full throttle takes more fuel than an idling engine. Your problen is in the low idle circuit in the carb or a bad intake gasket. I would tear that carb apart and blow it out. Sometimes the idle circuit can't be cleaned and a new carb is the fix. There have been times where I've soaked carb's for hours and still not get all the passageways clean. Good luck.
  5. John DiMartino

    John DiMartino LawnSite Silver Member
    Messages: 2,555

    Its running rich on the low end,especially if its hard to restart hot.Try starting it wide open when hot,this will help.I suspect a high float level,leaky needls/seat,or low spped adjustment is off.The air bleeds may be plugged up,blow them out,and use carb cleaner to clean up the gunk/varnish.
  6. thelandscaper27

    thelandscaper27 LawnSite Member
    Messages: 38

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