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  1. #11
    New Member
    Join Date
    Jun 2012
    Posts
    20
    Location
    bismarck, north dakota
    Tractor
    john deere

    Default Re: pony motor problem....need help

    i forgot to say that only one of my 720's have the problem, i think it is the 1957 moel

  2. #12
    New Member
    Join Date
    Jan 2013
    Posts
    4
    Location
    sykesville, md
    Tractor
    jd 720D

    Default Re: pony motor problem....need help

    Dear Larson:

    From Two cylinder Mag March 2013. I will check this tomorrow:

    The V-4 Starting Engine on my "70" Diesel has been
    completely rebuilt but seems to lack the power
    needed to crank the tractor engine over properly. The
    V-4 runs fine, a lot better now than it did before, but
    under load it looses power. I hate to have to tear into
    things after spending a lot of time and money on this
    tractor, so was hoping you might be able to offer some
    suggestions that would lead directly to a solution.
    Carl B., Ohio

    Check the clips used to position the ignition wires as
    they go from the distributor to the spark plugs. If they are
    pinching the wires too hard, a ground could be created that
    only shows up under load. It's not an uncommon problem.

  3. #13
    New Member
    Join Date
    Oct 2015
    Posts
    1
    Location
    indiana
    Tractor
    1955 john deere 70

    Default Re: pony motor problem....need help

    hello I just bought my 70 john deere I changed the oil in the pony I was having trouble draining it so I blue air back through the drain pipe it emptied filled back up went out an hour later and it was empty of oil I filled it again came back it was empty again where did my oil go

  4. #14
    Super Member
    Join Date
    Apr 2004
    Posts
    5,287
    Location
    East Coast of Lake Huron
    Tractor
    Deere, several

    Default Re: pony motor problem....need help

    Read the operator's manual on how to drain the starting engine's oil.
    Odds are the engine is still operating on two cylinders instead of four. Very common for mechanics to mix up the spike and spring loaded ignition coils and use the wrong wire on the coil.

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