Eyeballsdeep
Seaman
- Joined
- Jul 28, 2012
- Messages
- 63
Last year before the winter I got this 70 25hp evinrude to work on. It was for a friends friend. Local marinas wouldn't touch it. This thing had a lot of problems 
. First being the fact that it had no spark to the top cylinder. No prob, remove flywheel and start testing. Coils were good and good contact on points I purchased new ones aswell as condensers. They held a charge and seemed ok, But still I was at a loss. Why would there be no spark? New plugs were installed the wires were stiff but still has continuity. Every thing seemed to test out good. So I went in deeper pulled the ignition plate off and cleaned the brass contact plate. Removed the crusty build up of old oil from days gone by, and made sure all was clean so there would be a good connection. Still no spark. ?! So I pulled it all apart again. I looked at the coil wires and nothing was grounding out. Then I thought what about these kill button wires. After I removed the throttle arm it was aparent. 
You can see the shiny copper worn through the wire coating. I hope this solves that issue.
The other issue I found was this:
As you can see the gasket was completely gone on the head to intermediate section, why you ask? Cause the were 3 bolts missing and 3 that were loose. So the power head was just floppin around. This thing must have been leaking everywhere and smoking like a teenager out his bedroom window. Note the flap of paper gasket that might make everyone who owns a vintage runner such as this, to grow weary. That piece could potentially cut off the water supply and overheat your engine rendering it a parts motor. Now I have removed that piece of gasket and checked the lower unit and it did have about a tablespoon of water in it. So I will now remove the lower unit and pressure test it and see what we find. It can't possibly get worse! Or can it? Stay tuned!
. First being the fact that it had no spark to the top cylinder. No prob, remove flywheel and start testing. Coils were good and good contact on points I purchased new ones aswell as condensers. They held a charge and seemed ok, But still I was at a loss. Why would there be no spark? New plugs were installed the wires were stiff but still has continuity. Every thing seemed to test out good. So I went in deeper pulled the ignition plate off and cleaned the brass contact plate. Removed the crusty build up of old oil from days gone by, and made sure all was clean so there would be a good connection. Still no spark. ?! So I pulled it all apart again. I looked at the coil wires and nothing was grounding out. Then I thought what about these kill button wires. After I removed the throttle arm it was aparent. You can see the shiny copper worn through the wire coating. I hope this solves that issue.
The other issue I found was this:
As you can see the gasket was completely gone on the head to intermediate section, why you ask? Cause the were 3 bolts missing and 3 that were loose. So the power head was just floppin around. This thing must have been leaking everywhere and smoking like a teenager out his bedroom window. Note the flap of paper gasket that might make everyone who owns a vintage runner such as this, to grow weary. That piece could potentially cut off the water supply and overheat your engine rendering it a parts motor. Now I have removed that piece of gasket and checked the lower unit and it did have about a tablespoon of water in it. So I will now remove the lower unit and pressure test it and see what we find. It can't possibly get worse! Or can it? Stay tuned!