brendon19 Posted September 29, 2013 Share Posted September 29, 2013 (edited) Hi just took the new boat out for the first time today but the engine has a skip (miss) above half throttle i am not shore if it is the plugs or fuel problem ? It is like the engine shuts of for a second and straight back on again it only does it every 3 seconds or so. It is a 1982 35hp electric start evinrude 2 stroke Edited September 29, 2013 by brendon19 Link to comment Share on other sites More sharing options...
Jewdreamer Posted September 29, 2013 Share Posted September 29, 2013 Chexk the ful filter buddy or it may be an air leak in the fuel hose Link to comment Share on other sites More sharing options...
brendon19 Posted September 30, 2013 Author Share Posted September 30, 2013 Thanks dreamer i checked the filter its all good also just relaced the fuel line going to the carby as it was cracked and leaking still did not fix the problem. im thinking its the plugs? Link to comment Share on other sites More sharing options...
Nolongeramember Posted September 30, 2013 Share Posted September 30, 2013 Hi mate. If you had cracked and leaking fuel lines I would first go over the entire fuel system from the tank, the pick up and all the way to the engine. Then I would check the spark plugs and then I would open up the carby and check the insides of that. Link to comment Share on other sites More sharing options...
brendon19 Posted September 30, 2013 Author Share Posted September 30, 2013 Thanks but have already done all that. The carby was spot less inside Link to comment Share on other sites More sharing options...
Nolongeramember Posted September 30, 2013 Share Posted September 30, 2013 Did you check the jets are all clear? The tiny pin holes? Link to comment Share on other sites More sharing options...
brendon19 Posted September 30, 2013 Author Share Posted September 30, 2013 yep they were all good. going to replace the plugs tommorrow and see if anything changes Link to comment Share on other sites More sharing options...
spaners Posted September 30, 2013 Share Posted September 30, 2013 Sounds like a spark fault to me,breaking down under load.I would replace plugs then leads if you still have the misfire. Link to comment Share on other sites More sharing options...
brendon19 Posted September 30, 2013 Author Share Posted September 30, 2013 Thanks thats what im thinking. Will let you all know how it goes tommorrow Link to comment Share on other sites More sharing options...
brendon19 Posted October 2, 2013 Author Share Posted October 2, 2013 Just changed the plugs and took it for a spin and still the same but not as often and not as hard as it was before as were before it was jumping on the transom its only cutting out now? Link to comment Share on other sites More sharing options...
brendon19 Posted October 2, 2013 Author Share Posted October 2, 2013 Also the tips of the spark plugs are white Link to comment Share on other sites More sharing options...
The Incredible Hull Posted October 2, 2013 Share Posted October 2, 2013 Is it oil injected, or do you manually mix the oil? Link to comment Share on other sites More sharing options...
brendon19 Posted October 2, 2013 Author Share Posted October 2, 2013 manually mix Link to comment Share on other sites More sharing options...
brendon19 Posted October 2, 2013 Author Share Posted October 2, 2013 100:1 There is only one mixture screw and that if for idle Really trying to avoid taking it to a marina as they are pretty dear around here just for a service on a 25 hp johnson they charged $800 Link to comment Share on other sites More sharing options...
The Incredible Hull Posted October 2, 2013 Share Posted October 2, 2013 Mixed 50:1? Hmmm the only other thing that I can think of, is try changing the air\fuel mixture? I haven't done this before on an outboard, but have on my motorbike. Its a screw that allows you to twist, depending on which direction, makes it run leaner or richer. I'm taking a wild guess your outboard is running lean. Hope you get it sorted, let us know how you progress. Link to comment Share on other sites More sharing options...
The Incredible Hull Posted October 2, 2013 Share Posted October 2, 2013 I'm outta ideas dude =( Maybe try and take a video of it, and post it up here, perhaps that would give better insight. Link to comment Share on other sites More sharing options...
The Incredible Hull Posted October 2, 2013 Share Posted October 2, 2013 dude I got 1 more idea. There should be, like a kill or a stop circuit. Maybe try and disconnect it and see how that goes. Link to comment Share on other sites More sharing options...
brendon19 Posted October 2, 2013 Author Share Posted October 2, 2013 Think i will have to post a video but wont be till friday . The kill switch is all good it is only when you get over half throttle It starts doing it. Starts right up and idles like a dream. list of things i have done so far New fuel New plugs Checked all electrical connections stripped down the carb and cleaned many times Cleaned the spark plug connections im lost to what it could be dont know if its fuel or electrical Link to comment Share on other sites More sharing options...
Nolongeramember Posted October 2, 2013 Share Posted October 2, 2013 I still think your problem is fuel. On an old engine it is usually a blockage of some kind or a worn hose somewhere. Another thing you may not have checked I dont know, is the float level. Do those engines have any kind of fuel pump? Im not sure but you can check that if it does. Somewhere, somehow the engine is not getting the fuel it needs. Link to comment Share on other sites More sharing options...
brendon19 Posted October 2, 2013 Author Share Posted October 2, 2013 (edited) Thats the one thing i have not checked the float i just found the specs to do it so will tommorrow. Yes they have a fuel pump and filter on the side i know that works. brand new fuel line from the tank to the fuel pump and carby. Edited October 2, 2013 by brendon19 Link to comment Share on other sites More sharing options...
fredflathead Posted October 2, 2013 Share Posted October 2, 2013 I have had a similiar condition with 115hp Johnson of the same vintage as yours.The brother in law is a marine engineer, so I got a carb kit so he could fit it . On inspection of the motor before with started as it was my suggestion to buy the carb kit first so we had it on hand to fit. (thinking I was helping to be a good assistant) He found that one of the four coils had a broken wire, so off to the local marine place to get a coil. Works perfect now and have had two trips with no problems at all, also it was hard to start and would backfire before starting. Hope this helps as I had the problem for ages and it was very annoying when it would only go to half throttle to get to the ramp. regards norm Link to comment Share on other sites More sharing options...
Paikea Posted October 2, 2013 Share Posted October 2, 2013 (edited) Had a similar problem in a car many years ago. Turned out to be the plug leads breaking down under load. That was not an uncommon problem when leads first changed from hard copper wire to carbon filled as the conductor. As I recall, early Volkswagens were particularly affected. Hope this helps Cheers Paikea Edited October 2, 2013 by Paikea Link to comment Share on other sites More sharing options...
Flickn Mad Posted October 3, 2013 Share Posted October 3, 2013 Hey mate. If new plugs made the issue better you should look at the plug lead. My wifes old charade had a similar miss. new points and plugs helped but new leads made all the difference. Link to comment Share on other sites More sharing options...
brendon19 Posted October 3, 2013 Author Share Posted October 3, 2013 .Thanks for all the tips guys. Rang a local marine mechanic today and he was busy so he ringing me back tommorrow. If the timing was out could it cause the problem ? Will replace the plug leads if i can find them locally just waiting to hear back from the mechanic Link to comment Share on other sites More sharing options...
spaners Posted October 3, 2013 Share Posted October 3, 2013 Like I said,1 change plugs.2 change leads.Then go from there.Test the simple things first.If you have not got a multimeter go and get one. Link to comment Share on other sites More sharing options...
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