70evinrude troubles

Discussion in 'Bubba's Outboards' started by 75evenirude, Jul 15, 2009.

  1. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    iam needing help .

    I have an 1980 evinrude 70 hp ELCS .

    when I start the motor it sounds good,Idles and idles good.
    when I start out of the wake and I go to throttle , it starts to shake
    cough, and sometimes it will kick in full power. Where it starts to cough,
    I can back out of the throttle a little and it will idle out and stay pretty good speed. Now if If I go to full throttle it does this often.

    I had somone that rebuilds car carbs/ rebuild my carbs.
    New Plugs. New Primer bulb.

    Kinda curious
    what the symptons of a
    BAD STATOR
    BAD COIL
    Or Low Compression on a cylinder is?

    By the way , New powerhouse / Motor Block ???


    Evinrude in need of help ,can barely enjoy lake due to the boat having the flu ?
     
  2. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    Now when The guy rebuilt the carbs. He did not take
    any of the little Freeze plug Looking things Out. Iam reading
    in one of the post with pictures that is where the low And High
    in take or out puts are????? am I reading this right ?

    But they were not taken out and replaced? would that still be my
    problem?
     

  3. AwShucks

    AwShucks New Member

    Messages:
    4,532
    State:
    Guthrie, Oklaho
    Possibly. It is sort of like being almost pregnant. Your carbs were almost rebuilt. Generally when you short-cut on the job you get less than spectacular results. The symptoms your describing could be on the high end of your carbs, where they are not performing as they should. It could also be bad compression, where the engine runs at a slow speed, but will not handle high speed. It could also be that your linkage is not within the required tolerances. The first thing to do is to start eliminating possible problems... that means get a compression test made.

    Many auto part stores have loaner compression guages... they are not actually loners...you put down a deposit for the price of a new Gage. They let you take their old unit to run the tests with, and when finished, if you return the Gage they void the transaction and return your money. Others will run the test for you if you take the boat to their store. Be that as it may...you still need a compression test and that should be step one for any problem you experience on your motor and want to fix.

    Secondly, get a manual for your make, model and year of motor. There is an entire chapter about various linkage adjustments and you need to check them all. Especially the adjustment called "sync and link". Had a fella once complaining about his motor wouldn't plane...found out he had screwed the shifters stop lever out so far in an attempt to fix his problem, the shifter bottomed out before it could get the motor to half throttle. Thats the second thing you need... the manual.

    If you have done all the above and the motor is still not performing satisfactorily, rebuild the carbs. You don't need to take them to a carb specialist. If you have the manual and you can read, you can rebuild your own carbs. Nothing like the satisfaction of knowing you can handle 90 percent of the problems which may occur with your motor. I almost would bet you find the problem in the compression or the linkage. Carbs do need rebuilt, but the other problems are often overlooked in the rush to put a new kit in the carb.
     
    Last edited: Jul 15, 2009
  4. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    Now if I take the cowl or top off and its in drive
    and I reach back and throttle the carbs....It will sink the bottom
    raise the front and run like an raped ape.........and Would run good like
    that all the time?
     
  5. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    Good advice Lawrence. Another thing to Lawrence's good info is to take the air silencer off the front of the carbs, There is a little vacuum hose hooked to the bottom of the air silencer make sure it is hooked up. Now with the air silencer cover off put it in the water and let some one you trust run it and you set on the back and when she start acting up put 2 fingers in the mouth of the carb and if the carb is bad it will speed the motor up if it is good it will choke the motor down.
    I would start at the fuel tank inside with the pick up line and replace every rubber hose on it. Does your carbs have the black plastic caps if they do they are bad about warping.
     
  6. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    Then adjust the throttle cable or replace it
     
  7. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    Ok. I replaced the hose n bulb recently just to make sure.

    Now your talking about there is a plastic cover on the front of the carbs.
    There is supposed to be a Hose on it. Where does it hook too?

    I do see a niple , like an vacume hose on a car......at the bottom of my carbs? And I have always wondered if something belongs on it? its below the carbs......??? just curious
     
  8. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    the gas tanks are kinda old. I just recently had new throttle cable and shifter cable,deck and carpet.....supposely fixed this issue , but here I am.
     
  9. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    I will take pictures Of everything,and If I can post them on here I will
    try to show what Nipple Iam talking about?
    Iam computer literate/Not toooo good in boats......LOL
     
  10. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    If you can throttle that thing by hand then your cable is not adjusted right. That little barbed nipple is most likely where the hose goes. When I say replace the lines I replace all from the bottom of the fuel tank to the carbs and if you have six gal. plastic tanks buy new ones and take the pick up tube out and pull that little screen filter off the end of it and install you a good water fuel separator screw on filter or at least a good inline filter.
     
  11. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    Sounds Like I got alittle work ahead of me .I appreciate All The Good
    advice. I Will Get back to you all on this. Once again Thanks For The
    advice...
     
  12. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    Now that thing has two Cables, The top one controls the Idle
    what does the bottom cable control ,and Does that have anything to
    do with Idle OR Speed on Top In?
     
  13. Cutbait101

    Cutbait101 New Member

    Messages:
    281
    State:
    south carolina
    the bottom cable controls the shifting of the gears,foward,reverse and nuetral
     
  14. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    If the bulb goes flat ,what is that saying I need to do ?:roll_eyes:
     
    Last edited: Jul 15, 2009
  15. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    now does the bottom cable when you shift it into foward
    does it move the Idle or the throttle to give it more gas?
     
  16. Bubbakat

    Bubbakat New Member

    Messages:
    4,532
    State:
    McMinnvill
    If the bulb goes flat you have a blockage in between the bulb and the bottom of the pickup tube inside the tank.
     
  17. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    Thank you alll for your advice, Now I will apply it and hopefully fixing
    my problem. thank all. And this is a Pretty cool place where you get
    Friendly Advice......thanks for having me aboard. thanks ROBERt
     
  18. outdoors1988

    outdoors1988 New Member

    Messages:
    213
    State:
    Oklahoma
    I have the same motor and mine did the same thing do a compresion check on it the bottom cylinder was bad on mine. hope your is not the same problem
     
  19. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    well I Ran a can of seafoam through it, and tried 92 octane gas, and now it runs like worse, was running good with old gas and seafoam , new gas
    92octane , made it run worse.
     
  20. 75evenirude

    75evenirude New Member

    Messages:
    39
    State:
    Tennessee
    I took my boat to a shop and they are saying it's electrical
    Good Compression. Either a COAL or Stator is there any suggestions?
    It acts like its got power, then it acts like it wants to kick in ? Thanks for
    all the opinions in this.