1980 Evinrude 70hp Coil question, leaking clear/brown goo

[redfishsc]

Recently my 1980 E70elcsa 70hp Evinrude started losing power after a few minutes of running at plane. Feels like it's dropped a cylinder. Doesn't seem to be fuel related, I think I have a bad coil or similar. Sometimes while it's bogging, it will suddenly spring to life and you can feel a sudden kick of acceleration. Then it bogs back down suddenly.


After it cools down for a half hour I can usually get it back on plane for maybe 30 seconds.

When it loses power, it runs rough and idles rough, frequently shutting off, and I smell unburnt gas.

I have more investigating to do but I have no idea how old the coil packs and power pack is on this old engine. Take a look at the pics. Is this goo leaking out an indication of a failing coil pack? 2 of them are leaking but the top one is leaking the most, and it looks like it spurted some of it onto the power pack at some point.

Next question. Are OEM coil packs the best way to go here or are there aftermarket coils I should consider? I know in automotive stuff I never buy anything but OEM.


Background info:
Spark plugs are brand new Champion (Problem existed prior to plug swap).

Fuel is brand new, 50:1, with a fairly new hose and filter. Pumping the bulb does not change the rough running, neither does pushing in the key to engage the primer.

 

[racerone]

Replaced the impeller ?----Serviced the poppit valves ?----Tested the overheat horn ?----Does this powerhead have the electric primer or the choke plates ?

 

[redfishsc]

Impeller is new as of December. Overheat horn works, tested a year ago. I actually have the thermostat removed from it at the moment.

What poppet valves would a 2 stroke have?

This model has the electric primer.

 

[racerone]

There are 2 poppit valves found next to the thermostat !----The 1980 models did not come with a primer.----So sounds like someone added that along with some newer carburetors I think.

 

[redfishsc]

There are 2 poppit valves found next to the thermostat !----The 1980 models did not come with a primer.----So sounds like someone added that along with some newer carburetors I think.

Sorry, when I read poppet valves, I immediately think of intake/exhaust valves. I forgot about the ones at the thermostat.

The primer stuff wouldn't surprise me, I know for sure this motor was rebuilt. The pistons are 030 according to my boroscope.

And, the foot is off an older model. It has the spline type key on the drive shaft for the pump impeller instead of the wedge key used on a 1980.


Regarding the coil packs, is the goo leaking out of them in the photos an indicator that they are failing?

 

[saltchuckmatt]

Yes, melting coils is an indication but you need to determine if your engine is running hot. Buy an IR gun and test head temperature.

 

[redfishsc]

Understood. I did have a chewed up impeller so it's possible there's a clogged coolant passage.