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'86 Evinrude 60 hp engine bog

L

lfoshaug

New member
Hi,

I took the first ride of the season this weekend, after having the boat two years on shore.
Filled her up with fresh fuel with 1:50 oil mixture and went for a test ride.

At idle everything seemed normal, and up to 50% throttle it was working good.
As soon as i went over 50% throttle it started bogging, like it was starving for more fuel. I tried pressing the choke, and as i expected it revved up and ran like normal even at 100% with the choke engaged.

I cleaned the carbs, and it made no difference. Switched the fuel pump with another used one from a 35 johnson. Still no change. Replace all fuel lines, and even the fuel tank. Still the same.

Then I dissassembled the carbs and cleaned them in a part cleaner at work, and used compressed air to blow them dry.

After all this it works fine at idle, and it also runs good at 100% throttle.
It only bogs at about 40-70% throttle.

When i parked it two years ago everything was working flawlessly. Its the 60 hp with the electric primer pump.

What could be the problem? Is the "new" used fuel pump acting up? Anything else to check?
ideas?

Thanks,

- Lars
 
The electric primer is not a pump.----It is merely an electric valve.----When key is pushed in it opens and lets fuel bypass the carburetors.----If motor runs better with key pushed in then it indicates that there is a problem / dirt in the carburetors.-----Were the high speed jets ( brass and about 5/8" long ) in the bottom of the float bowl removed for cleaning ?
 
I cleaned both carbs once again, and its running great now. Only problem is that I cant get it to idle like it should. When i go into neutral it idles fine for the first seconds, then it revs and pops, and sometimes revs up really high. I have tried adjusting the idle adjustment screw, with no luck.

When i put it in gear again it runs great even on the lowest rpms.

Any ideas?
 
Everytime you take it apart, Clean it, You get different problems with the fuel system.

Cleaning fluid has crap in it.
Compressed air system has rust / dirt, crap in it.
It has run good at every speed range at least one time.

I do not think it is ta synchronize problem. But check it anyway.

I am concerned that you have possibly jammed tiny specks of crap in all the fuel & metering jets.

By chance did you clean the carb in a used parts cleaning tank with a pump in it ?
 
Yes, the first time i cleaned it in a parts cleaning tank. The second time i cleaned it with carb cleaner and compressed air.
The third time i used thin wire/needle to make sure all jets/passages was open, plus carb cleaner and compressed air.

It runs great at all RPMs, even at "no throttle" in forward gear. But as soon as i go into neutral it sputters a bit, and revs up.

I seem to remember it did the exact same thing after i had the carbs apart the second time. Altough I can not remember how i got it to idle normal again.

And yes, i believe the throttle plates are fully closed when in neutral. I can re-check it, as I also expect that they may be a little off, causing this problem.

Opinions / Ideas?

Thanks guys
 
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