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Results 1 to 8 of 8
  1. #1
    Join Date
    Jan 2010
    Location
    Dayton, OH, USA
    Posts
    164

    Default 1983 Evinrude 70hp idles great, no power

    I have a 1983 Evinrude 70hp on a pontoon. Just bought it and first time out. Motor starts and idles great. I put it in gear and no problems. I start to throttle up and it begins to accelerate but then bogs down and quits. Starts right up but I can get no power. This motor has no miss or idle problems but just won't run out. Any ideas? Carburetor? Ignition problem? Any help would be appreciated.

  2. #2
    Join Date
    May 2010
    Location
    Crossville (Lake Tansi), TN
    Posts
    7

    Default Re: 83 Evinrude 70hp idles great, no power

    I'm not as familiar with 2 strokes as with other engines, but if there is one thing I've learned from being on this site, it is that carbs and fuel lines are usually the culprit if it starts and runs smoothly. Also ethanol in the fuel has recently become a huge issue with all engines.
    Good luck
    ps: invest in an oem service manual from this site, it's worth it!

  3. #3
    Join Date
    Jan 2010
    Location
    Dayton, OH, USA
    Posts
    164

    Default Re: 83 Evinrude 70hp idles great, no power

    A friend says he had the same problem with a similar motor (I think his was a Johnson) and he said the problem was a bad "Hi-Speed Coil". I can't find any reference to a hi-speed coil in my manual. Can anyone tell me what it is and if it could cause this problem?

  4. #4
    Join Date
    Jun 2010
    Location
    Cape Cod, MA
    Posts
    51

    Default Re: 83 Evinrude 70hp idles great, no power

    I would check the entire fuel system first so you can rule that out.

  5. #5
    Join Date
    Jan 2010
    Location
    Dayton, OH, USA
    Posts
    164

    Default Re: 83 Evinrude 70hp idles great, no power

    That was my plan anyway but I was just curious if anyone has ever heard of anything referred to as a "Hi-Speed Coil". I can find no reference to it in the manual or online and was wondering what it was or if it was another name for something.

  6. #6

    Default Re: 83 Evinrude 70hp idles great, no power

    maybe a fuel filter, gas line not pumped up, or vent on tank not open....

  7. #7
    Join Date
    Jan 2010
    Location
    Dayton, OH, USA
    Posts
    164

    Default Re: 83 Evinrude 70hp idles great, no power

    You will never guess what it was and I feel pretty dumb. It turned out to be the prop. The motor came off of a bass boat and had a 14x17 prop on it. After talking to the guys at Anchor Marine in Speedwell, TN they suggested a 14x11. Boy what a difference. I still have a slight problem with stalling but will work that out. Other than that, it runs great. I knew prop size had a lot to do with performance but I still thought it would run...I was wrong.

  8. #8

    Default Re: 83 Evinrude 70hp idles great, no power

    Did u ever find out what a high speed coil is. Im having similar problems. Motor idles good revs in reverse with full power but forward has no power? my motor is a 1989 50 hp johnson any luck for u and help for me please ?
    Last edited by PeterW; 06-01-2012 at 10:18 PM.

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