Recent content by Neil1982

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    1975 Johnson 70hp

    Probably about 350 lbs in people and gear, plus 6 gallons of gas. to get 35mph i have to put the trim rod about 4 holes up.
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    1975 Johnson 70hp

    yes 17" prop. I can get 35MPH out of it if I set the trim rod up further but not in my regular running position.
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    1975 Johnson 70hp

    5K
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    1975 Johnson 70hp

    Just an update. I have cleaned the carbs, and I am firing on all cylinders. I replaced all the coils as well. I was able to get the tach dialed in, and I was running too low of RPMs when in gear after a little research. Now I have all cylinders firing, and I am running about 850 RPM in gear in...
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    1975 Johnson 70hp

    Fair point.
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    1975 Johnson 70hp

    Ok, so the compression wasn't as bad as I thought. New gauge readings are 110, 109, 110. Spark is good, but I have one coil pack with a crack, so I'm replacing all the coils. My adjustments to the throttle and gear cables seemed off, so I fixed those, and things appear to be better, but I won't...
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    1975 Johnson 70hp

    I have just changed the gear oil and spark plugs, I used Quicksilver Power Tune on it to try and clean out any carbon buildup and that's about all I have done to it.
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    1975 Johnson 70hp

    One thing I have done while waiting for a new compression gauge is spray carb cleaner into the carbs. The bottom two carbs showed significant change, but the top carburetor showed little to no change in the engine when I sprayed it while it was running. What could cause that?
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    1975 Johnson 70hp

    I just bought this boat, and it dies when shifting gears. It seems to lose a cylinder at low RPM and then clears out just above half throttle. I checked the compression, and I hope my gauge is wrong because it shows 75 psi on all three cylinders. Would it even run with that low of compression...
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