Stihl FS 75 & 80 over heating I think?

Discussion in 'Mechanic and Repair' started by Eagleseye, Oct 14, 2009.

  1. Eagleseye

    Eagleseye LawnSite Member
    Messages: 45

    Ok, this should be an easy one, for some of you. Have some older Stihl's that I have cleaned up and want to put back in service. I have removed engine and cleaned, new spark plug, fuel filter, new coil. I have removed piston to inspect; mild carbon on top of piston, rings look ok. Doesn't appear to be any scoring.
    Machine will start 3 to 4 pulls, and will run for about 8 to 15 min. depending on the working load, then will just die. They will restart when they cool.
    Any suggestions?
  2. ed2hess

    ed2hess LawnSite Fanatic
    Messages: 14,366

    New coil......gaped right? Clean out the exhaust port? Usually they don't get much in them however.
  3. milike

    milike LawnSite Member
    from MI
    Messages: 169

    new fuel cap???

    sounds like vent is plugged

  4. Accu-cut Lawn Care

    Accu-cut Lawn Care LawnSite Bronze Member
    Messages: 1,206

    Put new primer bulbs on them. They are overheating-losing gas due to a lean condition caused by that air leak.

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