1974 50hp engine miss/no idle

[Keyboardman]

Hi all, I'm new here as well as new to the world of working on outboards. I've done a lot of automotive and truck repairs over the years but this is my first outboard engine. My 1974 50hp Johnson will not idle and seems to have a miss also. I've rebuilt both of the carbs and put new spark plugs but it's still running just as bad. I've spent a lot of time adjusting the low idle needle valves but no improvement. I'm beginning to thing there might be other problems I need to look for. One thing I have noticed is sticky type fluid oozing down the side of the powerhead coming from what looks like two black units in the stator under the flywheel. Could this be a sign of something wrong there? Any and all advice on this would be greatly appreciated! Thanks in advance, Tim

 

[rookie456]

The black oozing fluid is probably the coating on the stator melting. I have a 1972 50 hp with black tacky streaks from under the flywheel also. I had a faulty rectifier on mine and I think it caused the stator to overheat.
Hopefully the experts here can give you more insight on what can overheat the stator.

 

[Keyboardman]

The fluid is clear not black but there must be something wrong there. I replaced the pump impeller and it doesn't run hot. Gas is pooling in the top carb so maybe I still have a carb prob??

 

[rookie456]

I thought the 72 and the 74 would have had the same power head, but after looking up part numbers for both, it turns out they are different. I am no expert, but I have rebuilt an outboard before with new Pistons, rings, bearings, etc.
I would think the experts would ask you for your model number so they would know the exact engine, pull start vs electric, etc...
Have you done a compression check, have you done a spark check, can the spark jump a 7/16 gap.
Also, if you don't have a manual for that engine, it's a good idea to get one.
Gas pooling out of the carb is probably the float not closing the needle, which could be a bad float, dirty carb, float not adjusted properly.
That's all I got, hopefully my reply bumps your topic to the top and more people will reply.

 

[Bosunsmate]

id pull the flywheel and inspect the parts, they might be shorting to ground.
Other than that do as 456 says

 

[Keyboardman]

Well, I did a compression test and got 145 psi on both cylinders. Spark tester showed a strong blue spark at 7/16" on both leads. I'm guessing that it's still a carb prob or maybe reed valves? I'm going to pull that top carb apart again and see if I missed something,,,,,,,,,

 

[Keyboardman]

Went though the top carb again and put in a new float as well. No change in the miss/pop problem. Anyone have any idea what to do next??????

 

[Bosunsmate]

Went though the top carb again and put in a new float as well. No change in the miss/pop problem. Anyone have any idea what to do next??????

read post 5 again

 

[Keyboardman]

Going down to auto parts store and buying the socket needed to pull the flywheel!

 

[Keyboardman]

I pulled off the flywheel and the magnets are a bit rusty. The sticky fluid is definitely coming from two black round units that are part of the stator located 180 degrees opposite each other. other than that I can't see anything grounding out in anyway. Is there anyway to test the stator or just shell out the $200 and replace it ?

 

[sutor623]

You can check the resistance according to the CDI manual. You can also check the cranking voltage if you have a DVA adapter for a multimeter.
http://www.cdielectronics.com/support/

 

[Bosunsmate]

some of those coils charge the battery the rest do the engine, i cant remember how to tell which is which

 

[Bosunsmate]

ive also re-epoxied mine with success

 

[Keyboardman]

Lots of great info on the CDI site! I don't have a DVA adapter but will be doing all the checking I can with my multimeter and post the results. Thanks Guys for all the help!!

 

[Keyboardman]

The ignition charge coils are the ones that are leaking. Waiting for a new stator to arrive. The trigger seems to test ok with an ohm meter so I'll be leaving that alone.