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  1. J

    jo hall

    I've been advised to replace the 30 year old impeller in my 1981 Johnson 70 hp. In fact more than one johnson mechanic has told me OMC recommends doing so every year. I have removed the 5 bolts that secure the lower unit to the exhaust housing and still it (lower unit) refuses to budge. It's...
  2. J

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    On a closer look the spring doesn't look so mishapen as I first thought. The picture on the left is the way I found it; the RH one is the way I assume it should be. In that configuration it is under tension, full range of throttle. In the other configuration it just flops. Don't know how...
  3. J

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    I have never been able to get this motor running properly at 8500 feet. Runs fine at idle but wants to stall when throttle advanced except if advanced very gently it will usually rev up to normal RPM. It will always rev up when in neutral but stalls as described when in gear (loaded). It...
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