1974 9.9 Sportwin 10424S Troubleshoot

Hey everyone,
New to the forum, been lurking awhile. Currently troubleshooting a 9.9 Evinrude. The motor has sat for about 5 years, and I had cleaned the carb out, as it was gunked up solid. Now, I ran it and it ran great, but then it died out on me after about 5 mins in the tank. I did a spark test on it prior to running the motor, and it was an orange spark, not the bright blue 1/4" gap you want. I did a resistance test on the coil under the flywheel, and got 1.1 ohms of resistance, and checked the points and have them both at .020 gap. I ran a spark check again, and its still weak orange. I noticed the armature wheel under the flywheel has sloppy play, and sometimes if you move it just right it will fire off, then die out. Coil 1 has a high primary resistance at 1.3 ohms, Most coils i have come across are in the .03-.08 ohms range. coil 2 has a primary resistance reading of .2ohms. I did a voltage output test from the coil under the flywheel with a DVA attachment and got 202VDC. Any reccomendations on what to try next?

thanks for any input

Re: 1974 9.9 Sportwin 10424S Troubleshoot

Don't know about all the readings, but a sloppy armature plate on that model is trouble, as the point gap changes in direct proportion to the distance of lateral play, which really messes w/timing and even proper spark. If you search this forum, you'll find some fixes/help. Shore that up, make sure you have spotless points gapped to .020" and recheck spark. Good luck!

Re: 1974 9.9 Sportwin 10424S Troubleshoot

thanks kbait, im gonna clean the point contacts, and i was reading on hear, someone said something that make a rubber or plastic piece to help with this issue, but others said it doesnt do much. Ill repost once i reclean and try the spark test again.

Re: 1974 9.9 Sportwin 10424S Troubleshoot

202 Volts is a good charge coil output, like K says, I bet it's dirty points. These magneto systems rarely pit the points due to the low currents involved, but they do get oxidation and grime on them over time, mostly due to sitting. My favorite trick for cleaning them is a white business card dipped in unleaded gas ( not pre-mix) repeat until the card comes out clean.