Stuttering '84 Evinrude 115 V4

Hi, my name is Tawrence. I recently purchased this boat with the 115, and the first time I took it out a problem occurred. I would put the throttle all the way down (full speed) but it wouldn't pick up speed. I left it down to see what it would do, and all of a sudden it just took off like it was fine. Then about 2 mins. later it just died out. It would only die when I go full throttle. It did this off and on, I never knew when it was going to go full speed, but I could hear the engine jerking like it wanted to go faster every now and then. When I got home I noticed one of the coils wasn't firing so I changed it. The next time it ran a little better but still wouldn't get full throttle (sometimes). What could this be, bad gas, compression, or etc? Maybe you can help me. Oh yeah I recently cleaned the carb and noticed that the lower one seemed to have bad gas in it, maybe that's the problem.  Any advice would help me. 

Thanks.

 

Sounds like a bad spark plug cutting in and out. The power pack (there are 2 on this motor) will do the same symptom. Almost feels like turning a switch on and off. I would bet the power pack that fires the bad coil is having some issues and needs to be changed. That would be my first guess anyway.

Randy

 

 

Please submit whatever questions you have to IHRTechTalk@yahoo.com.  All questions and answers selected will be displayed on this page as they come in.  Note: though all boaters are welcome, priority may be given to I.H.R. members.  Randy can not be held responsible for any advice given.  Though his information and expertise is second to none, he has no control over what you do with your boat.  It is up to you to boat safely and act responsibly, and his advice is only to be used as a guidance for your high performance boat/motor of which you are the one responsible for the risks involved.

Thanks,
Mark C.

 

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