• 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 elses 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 its posted at the end of someone elses 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

Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

Page Title Module
Move Remove Collapse
This topic is closed.
X
X
Conversation Detail Module
Collapse
  • Filter
  • Time
  • Show
Clear All
new posts


  • Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

    Hello everyone.

    I am having big problems with starting my Yamaha V4 115 HP 2 stroke engine when cold. When its hot it starts immediately.
    Ive cleaned the carbs several times thoroughly and adjusted the pilot screws according to the instruction book. The Solenoid Choker function is working sufficient and it closes the Choker throttle as it is supposed to. But somehow, it sems like it doesnt provide enough fuel when the engine is cold. I need to use compressed start gas to get it running every time. Then it starts almost emmediately and runs normally after a few seconds.

    Ive also tried to start without choke, with a little throttle opening and a lot of throttle opening - but same result. It cranks one stroke and the starter is disabled, without starting the engine. Sparkplugs are new.

    Try to take a look at this video which is an attempt to start it normally, with the choker activated.
    This is after trying a looong time and suddently it starts.

    Yamaha V4 115HP starting problem - Whats wrong ? - YouTube


    Its been like this for all the time Ive had it.

    Any ideas for carb adjustment ? What about the pilot / air screws, any experiences with adjustment ?

    Thanks in advance.

    Michael.


  • #2
    Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

    Michael.

    I have the same outboard and I am having the exact same problem. I started a thread to see if anyone could help me and just came across yours. I noticed that no one responded to yours. Did you ever find out what the problem was? I would appreciate the help. I have replaced the Bulb but it hasn't changed. I was thinking that maybe the fuel pump is weak and i should rebuild the diaphragm. Anyways any advice would help.

    Chavi.

    Comment



    • #3
      Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

      Check/replace the diaphragm in the choke unit. You can also press the key in to activate the choke before starting. This will deliver more fuel to the carbs. There is also an emergency start on the choke. Try these things to troubleshoot. When you say you think you should replace the diaphragm of the fuel pump, do you mean in the choke unit or the actual fuel pump itself? As long as you prime the bulb on the fuel line until it gets hard, then a faulty fuel pump would not be the reason the motor isn't starting. You can easily troubleshoot fuel pump issues by priming the bulb while the motor is running, thus becoming your own fuel pump. Focus your energies on the diaphragm in the choke, or just replace the whole choke unit.

      Comment



      • #4
        Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

        Guys I am having the same issues as you all and also posted a new topic. Did either of you figure it out? I don't suspect the fuel pump as fuel has gone thru it into the carbs. Fuel is not going from the carbs to the plugs. I'm wondering if it is the pulse lines not working.

        Comment



        • #5
          Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

          This is what two strokes do when it's cold.
          Mine does it.
          Crank it until it turns over. Sometimes it turns right off and makes kind of a humming sound. Crank it again. A couple of times and it will turn over, immediately hold the choke down and it will rev a little bit, this will keep it from turning off. Likely in cold water if you don't hold the choke down for a couple of seconds after it turns over it will die. Press the choke every time it acts like it is going to die. After about 15 seconds of this she is warm enough to stay running without your help. Much less of that needed in warmer water for me, but what y'all are describing is what I always see from my two stroke when the water gets cold. Same as you every start after that first one is a breeze with no choke needed, just a quick turn of the key.

          Comment



          • #6
            Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

            I have also have a 115, 86 model, that is sometimes challenging to crank when cold or when it has not been cranked in a while. For mine I first make sure that I have a jump box handy just in case the battery is not fully charged. I then turn the ignition switch over with out the choke for 5 or 6 revolutions. When it does not crank I will them push the key in to choke it and a gain try to crank it for 5 or 6 revolutions. I will do this a couple of times turning off the key between attempts. If it still has not started I try it without choking again. It will usually fire somewhere in this sequence. As mentioned after that all it take is a bump of the key to get it running. If the motor acts like it is slowing at all use the jump box. Hope this helps someone.

            Comment



            • #7
              Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

              How cold is it in Copenhagen? I am in Florida, so cold to me is 70 degrees F. :-)

              You could choke the engine and play with it a little while putting the throttle advance forward, raising the engine speed. You play with it until it reaches temperature and then Bob is your uncle. Unless of course you have not got enough fuel coming from the carbs. What the choke plate does is create vacuum behind it pulling fuel from the carb orifices. If you have any blocked up, it won't draw enough fuel to start.

              Don't use starting fluid to start a two stroke!

              Comment



              • #8
                Re: Yamaha V4 115 HP 2 stroke - Cold starting problem!!!???

                And make sure you open the throttle/ fast idle some when choking for cold start as it needs air along with the fuel

                Comment



                • #9
                  I have 94 95 Yamaha 115 and I have the same problem when starting when the motor hasnt been ran in a day or so and the weather has had nothing to do with it cuz it's been hot and still the same thing does anybody have an idea yesterday was the worst but it hadn't been ran in 3 weeks

                  Comment



                  • #10
                    Please start a topic on your problems, jg72c. This is an old topic and you shouldn't reply to topics with no activity for 90 or more days. Thanks.
                    Sent using a tin can and a piece of string. A technological breakthrough. The tin can is a 1966 Starcraft Nassau powered by a 1966 Merc 500.

                    Comment

                    Working...
                    X