Re: 1935 Johnson Aero built 300 fuel mixture

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May 6, 2017 at 9:16 pm #57209
chris-p
Participant

    I use John Deere corn head grease, or Lubriplate 105 in the gearcase.

    The 300 uses Champion J8J plugs gapped to 030.

    030 point gap

    1/2 pint per gallon of fuel.