• If this is your first visit to the iboats.com Boating Forums, be sure to check out the FAQ. To post a question or comment, begin by signing up. To start viewing messages, select the forum that you want to visit from the selection below.


Announcement

Announcement Module
Collapse

Help Tip: If you have a question that has not been answered to your satisfaction in the archives, it is always best to start a new thread of your own. By starting your own thread, you will receive the maximum number of views by forum members.

Below are some additional forum policies in hopes of all iboats members will follow, Thank you.

1. Please do not reply to old topics or hijack existing topics. Old topics of a technical nature are like a library book, Please do not write in them.

2. Old topics should be considered archives and used for reference only. Please do not reply to them.

3. Do not take over someone elseís topic (aka hijack) with your own question, even if it is similar. If you have a question that has not been covered to your satisfaction in the archives, it is always best to start a new topic of your own.

4. If you have a question for the original poster (OP) and the topic is over 30 days old, send the OP a PM, he may not even visit the forums any longer, or may not notice your question in the old topic.

5. By starting your own topic, you will receive the maximum number of views by forum helpers that may not even notice your question when itís posted at the end of someone elseís topic. And those answers will be specific to your particular issue.

6. Please do not post to topics that have been inactive for more than 3 months unless you are the original poster. We have very active forums and any topic that remains inactive for that long should be considered "dead". It is especially confusing when there is an entirely new question posted to an old topic.

7. Posting at the end of any topic is considered to be hijacking the original posters topic which in turn subjects the topic to be closed if it continues to happen thus not making it fair to the original poster in the future had for some reason he/she needed to return for additional information or provide an update of the problem solved which is always welcomed within a reasonable amount of time frame.

8. Please note that you should see a red banner pop up near the bottom of each inactive topic asking you not to reply to old topics. The Red banner will read: Please note this topic has been inactive for 90 days. For the best results, please start a new topic.

Thank you all in advance for doing your part in helping iboats run a smooth ship.

Additional forum rules linked below.
http://forums.iboats.com/forum-rules-guidelines-405/
See more
See less

Significant Loss of Power, Throttle hesitation with 1984 9.9hp Evinrude

Page Title Module
Move Remove Collapse
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Significant Loss of Power, Throttle hesitation with 1984 9.9hp Evinrude

    So here's the background story. I recently acquired a 1984 Evinrude 9.9hp outboard model: E10BALCRA, AC Lighting rope start. It started well when tested but then would not start after purchase and i took it into shop where they charged me for a couple hours work to fix what they said was an electrical problem (was told some wires were loose under the fly wheel and were shorting out the motor).
    So the shop got it starting for me and i took it out for a run on my 14 ft alum fishing boat. The motor ran well initially with the exception of acceleration not being so smooth on the throttle (throttle hesitation?) - motor would not power at same rate of throttle being turned, and you had to full throttle it to get it going and then could decelerate to less than full throttle.
    Anyhow, so it ran well for about 5-6 hours of maneuvering about at various throttle speeds and with multiple breaks for fishing. Then I had to run it in full throttle in reverse (not sure if related to problem) to avoid collision with a barge coming around an island, and have been having the following problem since:
    The problem started to present like the engine was running out of gas, sputtering and losing power (had plenty gas). When at full throttle the motor would just slow down and run at about half power. It would go between running at half power for a few minutes to back up at full power without having changed the throttle. Kind of felt like the engine was getting overheated or it was not getting fuel. Sometimes it helped to turn it off for a few minutes and let it cool off, but eventually before making it back to the ramp, it only would run at half power. I tried taking it back on the water again and it will still run but at about half the power that i know it is capable of.
    I was lucky to be able to take a couple video clips and are attaching two videos to show engine running. Both are at full throttle, one when running well and the other when experiencing the above mentioned decreased power. You will be able to see and hear (sputtering) the difference in how the engine runs. Just want it running well again.
    http://www.youtube.com/watch?v=RPZ2HESyaZ4
    http://www.youtube.com/watch?v=uHb03Y5yEeU
    Please advise and help me diagnose the problem. I really can't afford to take it back to the shop again. Thanks for your help.


  • #2
    Re: Significant Loss of Power, Throttle hesitation with 1984 9.9hp Evinrude

    I'd say it's a bad ignition coil (or loose connection to the coil). A weak coil will shut down when it starts getting hot thereby dropping a cylinder and causing the symptoms you describe. It's tough to accurately test a coil with a meter (or, should I say, it's tough for me to test a coil). Hook up an induction timing light on the top plug wire and watch for intermittant flashes, then check the lower plug wire and do the same. This test will show you a weak coil. Did the shop elaborate at all as to what wires they worked on?
    United States Coast Guard Officer #1172938
    Catamount Marine

    Comment



    • #3
      Re: Significant Loss of Power, Throttle hesitation with 1984 9.9hp Evinrude

      here is a electrical diagram.

      start to check spark first, to confirm if ignition works well
      if ok, then check copression at both cylinders(should be equal and more then 80 psi),
      its good to clean the carb , put apart and clean all with carb cleaner soakink over night, and blow witch compresion air,
      Attached Files

      Comment



      • #4
        Re: Significant Loss of Power, Throttle hesitation with 1984 9.9hp Evinrude

        The shop only said some wires were loose and were shorting the engine. I'm been up trying to research this problem. One thing I just found and rectified was a problem with the throttle twist grip gears on this model motor. They were out of sync, and i have just corrected it. I really hope this is the only problem. Posting a couple pics of what was off. If not i will look into your recommendation. Thanks.
        Click image for larger version

Name:	07003068df7689af06902150eaa3aa1a.jpg
Views:	1
Size:	36.4 KB
ID:	106538Click image for larger version

Name:	5bed8a0cae0cd080716ff8af24de8804.jpg
Views:	1
Size:	74.7 KB
ID:	106539

        Comment


        Working...
        X