Evinrude 8hp sputter

[Pinboy122]

Hi everyone!
I have a 1985 Evinrude 8hp J8RCOB that has been giving me trouble for a while.
It usually starts up within 3 or 4 pulls but while it’s cold it sputters and pops a lot and will usually die several times especially if I try to give it throttle. this will go on for a few minutes until it warms up enough to take more throttle a little at a time. Once it’s warmed up it runs fairly well,but the sputter/miss/sneeze whatever you want to call it will occasionally return usually from mid to high rpm and if your not expecting it you almost get tossed forward from sudden deceleration.
What I’ve done so far: rebuilt fuel pump, thoroughly cleaned carb and replaced float and needle, new fuel line and bulb. I pulled 1 spark plug wire at a time while running and it does the same thing with both cylinders..
Anyone have a clue what’s going on? I feel like I should be popping the flywheel off to have a look around but I’m hoping someone can point me in the right direction

Thanks. Al

 

[Pinboy122]

Also, the engine calls for 100:1 oil. I’ve never run it that lean, usually 75-50:1
this evening because it kinda sounded like a running lean issue I bumped the oil up quite a bit. My boy just took it out for a scoot and I could hear it falling on its face all the way down the lake.

 

[Rook66]

Hi everyone!
thoroughly cleaned carb

When you say you "thoroughly" cleaned the carb did you remove the expansion plug item #0202310, item #10 on the Evinrude carburetor diagram to see if there's any trash trapped there?

I cleaned the carb on my 3hp Johnson and it still wouldn't run so I took it all apart again and that time I removed the expansion plug and found that the little holes there were plugged up. I snipped a wire from a wire brush and rodded those holes out and sprayed them with carb cleaner and then blew it out with air. Put it back together and it ran like a sewing machine.

You can remove that expansion plug with a small center punch. Tap it with a hammer lightly in the center of the plug until you have a small hole in it and then pry it out. Careful that you don't drive the punch though the plug and into the carb and ruin it.

You can replace the plug with a new one by using a flat nose punch that is about the same diameter as the expansion plug. Put the plug over the hole in the carb and tap the punch with a hammer until the concave shape of the expansion plug is flat.

 

[Pinboy122]

I believe I fixed the problem. New set of plugs and a different fuel pump I found hiding in the bottom of the toolbox. Not sure which one did the trick