Reply To: 1957 Johnson Javelin 35 – Service Manual

Home › Forum › Ask A Member › 1957 Johnson Javelin 35 – Service Manual › Reply To: 1957 Johnson Javelin 35 – Service Manual

September 4, 2025 at 10:42 pm #299640
David Stanton
Participant

    US MEMBER PAY BY CHECK
    Nooge wrote:

    and info regarding jetting for altitude would be very helpful.

    Your 35 Javelin has high and low speed carb adjustment knobs, so there is no “Jetting” for altitude.  Just get it idling good with the low speed carb needle, and then, at wide open throttle on a boat, adjust the high speed carb knob for highest RPM “sweet spot”, which can vary with altitude, and you will be able to hear when it’s at optimum high setting — no need for a tach.

    Your gas/oil mix is 24 to 1.  Use ethanol-free gas if you can get it.

    Dave