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Type: Posts; User: kentrx1

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    Re: Carburetor swap question

    Thanks for your expertise!
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    Re: Carburetor swap question

    My question is with it being different jet size would that be an issue? I wonder if there is some change between 1987 and 1989 that required a jet change.
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    Carburetor swap question

    I have a 1987 etlh 70 hp Yamaha that I got used and had sat for a long time. I have disassembled carbs, cleaned, ultrasonic cleaned, recleaned and still can not get mid level acceleration smooth. ...
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    Re: Precision blend adjustment

    You can see my confusion. Not a stamped mark and no obvious line on body of Oiler. Book makes it seem like it is obvious. I do appreciate your help.
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    Re: Precision blend adjustment

    i am looking at the same manual with same picture. i just do not see the marks the manual references. i will post another picture with it in default position. the default without rod on it...
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    Re: 1987 70 hp etlh acceleration rough

    After chasing this for a year I think I finally found my main issue. Linkage was not adjusted correctly and throttle was not opening but halfway. The linkage with timing was advancing timing too...
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    Re: Precision blend adjustment

    So the spot under the spring hook? The Manuel says to line it up with line on pump. Sorry to be a pest but what mark on pump body? The service Manuel is not very clear.
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    Re: Precision blend adjustment

    Would you suggest just removing precision blend system and prefixing? If so, what is involved in conversion?
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    Re: Precision blend adjustment

    Not that I know of but I was not the first owner. Engine looked stock to me. With that being said if I have been chasing a rough running mid range rpm gremlin for a year now. The reason I was...
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    Re: Precision blend adjustment

    20693
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    Precision blend adjustment

    1987 etlh 70 hp Yamaha. Trying to adjust oil blend lever. Manual says to line up punch mark on pump lever with line on pump body. I can not locate a punch mark. Has anyone tried doing this?
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    Re: 1987 70 hp etlh acceleration rough

    Noticed a slight surging at mid throttle now. Not a strong surge, just enough no notice. Seems to disappear once throttle opened up above 75 percent
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    Re: 1987 70 hp etlh acceleration rough

    Quick edit I also installed a new fuel pump and fuel filter.
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    Re: 1987 70 hp etlh acceleration rough

    Ok. New season and playing with my project again. I rebuilt the carbs, boiled out in ultrasonic, and no difference. I checked compression and all 3 cylinders between 105 and 115, and that is with...
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    Re: Rough mid throttle

    I pulled plugs and the third cylinder is not burning properly. Thought maybe weak fire. Pulling one wire at a time rpm drops about same no matter which wire I pull. The top cylinder seems to have...
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    Re: Rough mid throttle

    Thanks for your reply. I did carefully clean them using heated ultrasonic cleaner then used air to blow passageways out. I am comfortable that they are cleaned properly As for the setting I am...
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    Re: Rough mid throttle

    Is there any concern of getting it too lean and burning a piston as long as I seem to find the “sweet spot”? Even if I am a full round from specs?
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    Rough mid throttle

    Have 1987 70 hp 2 stroke Yamaha etlh. Have been trouble shooting for 2 seasons. Problem is with rough mid range acceleration. Idles fine. From 80 percent to wide open throttle fine. In between...
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    Re: 1987 70 hp etlh acceleration rough

    Have had to work way too much this summer but had a chance to play with pontoon again this past weekend. Everything I have checked has seemed fine so far and I pulled plugs and they seem to be all...
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    70 hp Yamaha 1987 not charging

    My engine quit charging this past weekend. My depth finder shows batter charging and suddenly it was not showing water depth and voltage dropped down to battery voltage (12.6) instead of the 16 plus...
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