Logo
FULL SITE MENU

Search results

  1. W

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    racerone, thanks for the heads up. glad to find that out before i started drilling anything. i can't find an orifice chart for this era 70hp anywhere, if you have any advice on what altitude adjustments are appropriate, i'd appreciate it. pending other input, since it runs fine at idle I might...
  2. W

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    based on parts diagrams, various research and the info at the beginning of the thread i have no reason to think that it isn't... the 54D idle air orifice is at the top of the carb, the 32 fuel orifice is in the fuel bowl. i'm not a complete noob to engines, I own a lot of old stuff but you...
  3. W

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    yup, I pulled them to check. the only chart I can find is for 85hp and up, it lists 58/30 orifices for air/fuel on the 85hp so 54/32 on this 70hp seems to be in the ballpark. regardless it runs great at low altitude so I'm ok with using them as a baseline. that said if you have any better...
  4. W

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    the image didn't seem to attach right so here's a direct paste on the #s starcraft evinrude 70 alt adjustments dia area area change equiv dia wire air bleed sea level to 3000 54 0.055 0.00950 air bleed 3000 - 6000 52 0.0635 0.01267 diff 54 to 52 0.00316...
  5. W

    High altitude adjustments for 1981 Johnson 70hp mod J70ELCIM

    I'm going to resurrect this very old string because I'm having the same altitude issues on my '78 Evinrude 70HP outboard. I can't find orifice charts for that specific motor but it has 54D air bleeds and 32 fuel jets and it runs great at sea level. I live in the foothills and regularly visit...
Back
Top