JW-21 3hp Johnson no longer idles after cleaning the carb

CapLog

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Joined
Jul 22, 2022
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5
I bought this outboard a little over a week ago and the previous owner started it for me before I bought it. I took it home and the next day couldn't get it started myself with the pull cord. I then tried starting it with a drill and though it took a really long time I finally got it to start up. once it had started and warmed up I could shut it off then restart it with the pull cord no problem. I took it out on the water a few days later and while I did have to drill start it, it ran perfectly and at the end I tested the idle and it idled great all the way at the lowest speed. After this it still wouldn't cold start without a drill so I took the airbox, throttle linkage, and idle screw off and sprayed in some carb cleaner through the drain plug in the bowl. I put everything back together and poured a bit of sea foam in the gas tank. After running it for a while I now have some other problems. Starting it is a bit easier, I can get the pull cord to get it running after sitting cold for 24 hours, but the motor dies once I move the magneto down to start position or lower. It will not idle what so ever. I also have the idle screw as lean as it will go and moving it over to rich causes the engine to die even at full throttle. I have also noticed the spark plugs blackening and lots of white smoke (which I assume is from the sea foam). Please help I have no idea what to do. Am I hurting my motor by running it like this?
 

CapLog

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Jul 22, 2022
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5
TLDR; my outboard wont idle and is running rich despite the idle screw being set as lean as it can go
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,504
Does spark jump a gap of 1/4" on both leads.----Perhaps it is running on 1 cylinder.
 

racerone

Supreme Mariner
Joined
Dec 28, 2013
Messages
38,504
This test does not involve the sparkplugs.----You are testing the magneto for maximum output.----Does spark jump a gap of 1/4", yes or no ?
 

CapLog

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Joined
Jul 22, 2022
Messages
5
This test does not involve the sparkplugs.----You are testing the magneto for maximum output.----Does spark jump a gap of 1/4", yes or no ?
I am not familiar with testing a magneto, how would I do that?
 
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