No Spark on 1977 Evinrude 15754M

[Stevum]

Hello to all,
This is my 1st post on this forum & look forward to your help & expertise. I recently purchased a 1977 15 HP 15754M electric start outboard motor that's in great condition cosmetically but needs some motor help. I got this thing for $40 as at the time it would not shift, I had my suspicions & the 1st thing I did was drop the lower leg & sure enough the shifter rods had been disconnected. I lined everything up & re-***embled it & confirmed that I now had F,N & R. New problem, the motor was seized so I took some advice from this forum & others & laid the motor horizontal with the pistons vertical & filled the cylinders with diesel fuel each day for 3 days. I rocked the flywheel back & forth & the pistons broke free surprisingly easy. Thinking that I had a good thing going I mixed up a fresh batch of 25:1 fuel, hooked up the lines, got good bulb pressure, filled the water tank I use for testing, hooked up a battery & away we go. The motor would crank over very easily with no hesitations. After about 10 - 5 second tries over the period of 5 minutes nothing sounded promising. I pulled the plugs & found out I had no spark to either one. I did a compression check & each cylinder has an equal pressure of 90 PSI. My question to you guys is where would you start to find spark? I haven't disconnected the kill button yet as that would be an easy fix if that was the culprit. I'm afraid it could be the coil or power pack & I have to be honest my electrical skills are minimal. Any ideas on what I might be able to check with a multi-meter would be greatly appreciated as we all like to get them fixed the quickest & the cheapest if possible. Thanks for you time! Steve

 

[boobie]

Re: No Spark on 1977 Evinrude 15754M

Disconnect your kill button first and see what happens. If that doesn't do it go to cdielectronics.com as they have good trouble shooting procedures. Let me warn you, to check out these systems correctly you need more than just a plain multi-meter.

 

[kbait]

Re: No Spark on 1977 Evinrude 15754M

To disable the kill switch, just disconnect the wire from stop button that goes to ground. If still no spark, and no visible cracks in your coils that are arcing to ground, you likely have a bad cd box. Go to the site boobie suggested ^. You can test other components of your ignition system under flywheel for resistance/shorts to help nail down the actual issue.

Good luck!

 

[reload]

Re: No Spark on 1977 Evinrude 15754M

I thought the 15 hp didn't have cdi til 85. I am confused.

 

[Stevum]

Re: No Spark on 1977 Evinrude 15754M

I got a chance to tear into it further & discovered that the power pack has a serious overload at sometime before I bought the motor. The mounting holes were melted & so were the 2 leads coming out of the pack. I can replace this component but before I do I was wondering what may have caused this? Any ideas will help before I burn up another one. I thought maybe it would be a battery issue as this 15 HP does have electric start. Also, while I'm on here would it be OK to run this without a battery? I know some motors (like ATV's) are not suppose to be operated without a battery hooked up, maybe that was the original problem. Thanks!