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djgwest...
djgwest...

Posted: Wed Jul 22, 2009 3:48am

Post Subject: My Honda outboard wont run on idle

I recently bought a boat and it came with a Honda 100 CDI 4 stroke, I believe its about 1997-98, it has been running fine untill about a week or so ago when it started stalling on low revs, now it will only run on medium or fast revs, but stalls when the revs get close to tickover speed, I have replaced the plugs and the petrol filter, all the fuel pipes seem clear, can somebody please advise me of what could be wrong and how I would fix it,.... I am out of work at the moment due to an accident so funds are low, so it would help if I could fix this myself... Thank you. Gordon

Tony-B...
Tony-B...

Posted: Wed Jul 22, 2009 8:20am

Post Subject: My Honda outboard wont run on idle

Dear Gordon, I can only speak generally about outboards and not about the Honda specifically. I trust a reader will come along with better information for you. Often outboards get a lot of throttle response by advancing the spark and they do this by twisting part of the engine under the flywheel as you rev the engine up. Although I do not think it will be the problem take a look at the part immediately under the flywheel while someone opens and closes the throttle. I expect you will see something twisting round. My knowledge is not up to date enough to be sure how the petrol is delivered to the engine. If it is via fuel injection (like modern cars) I fear you will need specialist test equipment to diagnose the fault but if it has a carburettor I suspect you have had some dirty fuel and the idle or progression jet/drilling is now blocked. If you have already had the carburettor apart have you disturbed the idle control setting? There is very often a screw that allows you to adjust the idle speed and/or idle mixture. Get that adjustment wrong and it will not idle. Some OMC outboards (Evinrude/Johnson)also had a high speed mixture adjustment, but I doubt yours has being much more modern. However the manual should tell you. It will also tell you how to do the adjustments. Typically you screw the idle screw fully in without forcing it, undo it three turns and with a warm engine work both ways from there to get a steady idle. Lastly when the magic electronic control boxes start playing up you get all sports of funny symptoms, but again often dedicated equipment is required to diagnose it. If this is a twin cylinder engine you may have lost the spark to one cylinder. Taking care not to give yourself a shock jamb each plug in turn against the engine so you can see the spark gap and attempt to start. Both plugs should spark across the gap. If you find one has no spark then it is likely to be a faulty lead or coil. Over to our readers for more help. Tony Brooks

djgwest...
djgwest...

Posted: Wed Jul 22, 2009 2:43pm

Post Subject: My Honda outboard wont run on idle

Thanks Tony, some of the other boat owners helped me take off the carb and it looked fine,.. jets clear etc, everyone I have asked say there stumped, could the carburettor be goosed? even though it appears to be fine, if it is goosed does anyone know where I can pick one up, even a used one will be good from a broken engine,..what else could cause it to stall on low revs.. has anyone had this problem with their Honda outboard.thanks again

Tony-B...
Tony-B...

Posted: Wed Jul 22, 2009 3:46pm

Post Subject: My Honda outboard wont run on idle

Dear Gordon, now you choose to tell me a little more about the problem I would want to check that the carburettor gasket or rubber seal is in good condition and fitted without any gasket goo, in fact it should be a new one. As long as there is not any significant play in the throttle butterfly shaft I doubt there is anything wrong with the carburettor, but again, if you are still withholding any of the history and symptoms (like stale petrol) there may still be a carburettor problem. I assume that you took the carburettor to a garage and got the drillings and jets blown out with their airline. Just looking and poking about is more likely to cause damage than solve anything. Being a four-stroke it would not hurt to do a compression test as well. Tony Brooks

djgwest...
djgwest...

Posted: Wed Jul 22, 2009 8:01pm

Post Subject: My Honda outboard wont run on idle

Thanks again for that,.. the seal on the carb is in perfect condition and we made a point of cleaning it anyway, however we didn't blow the parts through with an air line, the fuel was filtered and was fresh but this weekend I will remove the carb again and take it to an air line to make sure, so the spark plugs are fine and the carb is likely to be ok. If its something electrical, would this not cause some problems on medium and high revs too? If anyone out there has any idea's please let us know, thanks thanks again...

Markadrian...
Markadrian...

Posted: Tue Jul 28, 2009 3:35pm

Post Subject: My Honda outboard wont run on idle

Hi Gordon, my friend had exactly the same isssue with his Honda of a similar age. In his case it turned out to be loose mildly corroded connectors to his CDI unit. A tiny twist of the CDI unit and a spray of WD40 gets him on his way. The CDI unit itself seems unafected. Hope this helps.

Tony-B...
Tony-B...

Posted: Tue Jul 28, 2009 5:14pm

Post Subject: My Honda outboard wont run on idle

Very many thanks for your input, I just wish more readers felt able to help. All along I felt there was a good chance it was an ignition issue, but not being familiar with the system could not suggest any checks or tests. Tony Brooks

djgwest...
djgwest...

Posted: Tue Aug 04, 2009 1:10am

Post Subject: My Honda outboard wont run on idle

Thanks Mark and Tony,..what does the CDI unit look like,.. is it the small black box close to the carb,... anyway we have cleaned the carb and checked it 3 times, we have flushed the fuel lines and put fresh fuel in, new spark plugs and renewed the seals and gaskets etc yet it still refuses to run on low revs,... I will try the CDI unit once I know what it looks like,... im really new to outboards,,.. cant you tell lol Anyway failing that could the timing be out? Thanks gain for the input,.. we will get there in the end im sure.

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