• 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

Johnson 4hp (1969) tune up (high and low speed)

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


  • Johnson 4hp (1969) tune up (high and low speed)

    Hi,

    I recently got an old Johnson 4HP engine (model :4R69R)

    It didn't start so I cleaned out the carb and replaced the ignition parts (coils, points, spark wires etc)
    Now it starts and runs fine but I have no clue how to 'tune' the high and slow speed needle.

    Does someone have some tips for this ?

    Thanks,
    Greg

    PS : we want to use the engine for our recently bought Corsaire trailer sailer

    Click image for larger version

Name:	fb5af2ad1387f5ede53f5c5c749ae6b9.jpg
Views:	1
Size:	140.1 KB
ID:	104319


  • #2
    Re: Johnson 4hp (1969) tune up (high and low speed)

    Welcome!

    Follow this link:

    http://forums.iboats.com/showthread.php?t=167352

    This link and other helpful links are found under the "Top Secret Files" stickies...the first thread on this forum.

    Mas
    "New" '57 Lark Chapter One...the Find:
    http://forums.iboats.com/showthread.php?t=370037

    "New" '57 Lark Chapter Two...the Initial Breakdown:
    http://forums.iboats.com/showthread.php?t=370666

    "New" '57 Lark Chapter Three...the Gearcase:
    http://forums.iboats.com/showthread.php?t=370904

    "New" '57 Lark Chapter Four...the NOS Powerhead:
    http://forums.iboats.com/showthread.php?t=456868

    "New" '57 Lark Chapter Five...Repainting:
    http://forums.iboats.com/showthread.php?t=523546

    Comment



    • #3
      Re: Johnson 4hp (1969) tune up (high and low speed)

      HI iGrif. Welcome to iboats. The link above is great. Be sure you run the motor in a test tank with water filled up to about and inch or two below the main exhaust port while dialing in the idle. These older models can't run on muffs. Also be sure that you tweek the settings once you've actually got the motor on the water. Setting the lo speed idle in the test tank will get you close, but most tanks don't offer the same exhaust back pressure that the open water can, and you need to reach WOT under laod to set the hi speed needle properly anyway. While trying to dial in the idle, snug down the brass nuts that the hi/lo needles pass through into the carb such that you can still adjust the needles as needed, but not so loose that the needles can back themselves out due to the vibrations of the motor. Once the needles are set, tighten down the brass nuts the rest of the way and you shouldn't have to fiddle with them again. Here are some other handy links. Good luck.


      http://www.outboard-boat-motor-repai...%20Tune-UP.htm
      http://forums.iboats.com/showthread.php?t=167352
      http://www.duckworksmagazine.com/07/...max/index1.htm

      Comment



      • #4
        Re: Johnson 4hp (1969) tune up (high and low speed)

        thanks for the replies, lot's of useful info behind the links you both provided !

        I have the engine in a big watertank so that's covered, as long as I can get it to run more or less ok then I can do the final adjustments next time we're on the water !

        good tip about the brass nuts though, I didn't realize they were used to 'lock' the needles in place.

        Comment



        • #5
          Re: Johnson 4hp (1969) tune up (high and low speed)

          I wouldn't tighten them to the point the needle is locked. At the very least I'd wait until you have a few trips on the motor. They only need to be snug enough that they don't vibrate out of adjustment. Best of luck. Rick.

          Comment

          Working...
          X