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fuel cap causing loss of torque under high load (running lean)

Discussion in 'Mechanic and Repair' started by curiousman, Jul 16, 2012.

  1. curiousman

    curiousman LawnSite Member
    Messages: 3

    Spent a couple of days before I found the fuel cap was not letting enough air through when mowing tall/heavy grass.

    Probably will replace fuel cap once a season now, to reduce chance of running too lean some of the time.

    Fuel cap appeared to be clean on top & bottom. Air hole was clear. Finally tore cap apart & found a thin film of silt on all the internal parts. (about 240 hours run time)

    I know I should have checked it sooner but appeared to not be clogged when looking at it & cylinder #1 had lower compression than #2. Replaced head gasket, but still had loss of power under high load. Then found fuel cap was the problem.

    Deere 757, Kawasaki 25hp

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