1990 3hp please help me troubleshoot

a70eliminator

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Sep 9, 2007
Messages
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I rescued this 3hp evinrude (e3bresr) from being scrap aluminum, gave the guy $25.00.
So I cleaned it's internal fuel tank, pulled carb and cleaned the main jet emulsion tube, the float setting looked good and the needle and seat appear decent, put it all back together and checked spark by pulling rope and watching plugs, they both sparked, started it in a barrel of water and it overheated right away so i pulled the impeller and found the key was missing and impeller looked brand new, so I carved a key from nylon and now it runs cool although it seems rouhg and wont idle for well also has trouble revving up, wont run long before stalling, low speed setting doesn't do much.
I think the plugs are wrong Autolite 4123's when motor calls for Autolite 2665, don't know if it makes much difference, anyhow are there any points or anything under the flywheel that could be causing weak spark? Sorry for the long winded.
 

racerone

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Dec 28, 2013
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38,411
Re: 1990 3hp please help me troubleshoot

do a compression test first.
 

boobie

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Nov 5, 2009
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20,826
Re: 1990 3hp please help me troubleshoot

There are points, coils and condensers under the flywheel. The spark should jump a 1/4" open air gap on a tester.
 
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a70eliminator

Captain
Joined
Sep 9, 2007
Messages
3,762
Re: 1990 3hp please help me troubleshoot

I do know it will spark across the electrode .030. but i'll go out and see how big of a gap it will arc.
I ran it again and it seemed like it was going to run, but then again after about 5 or 6 minutes it begins to act like it's running out of gas, it just slowly quits, I pulled the bowl again and it's all clean pulled the jet tube all clean, gas flows free from tank, I just don't get it>
 
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