Evinrude problem.

[crazydrywallguy]

I have a evinrude 9.5 sportwin 1967 and im having trouble with it loosing power with the cowel on. When i pull the cowel off it runs PERFECT,but when i put the cowel on ,it bogs and looses power. I know about the leaky seal that allows exhaust in and can choke the motor,so what i did was filled up the gasket with water to make a good seal and it still does the same thing,so i know its not that troublesome gasket. It was smoking quite a bit,do you think that it could be sucking in the fumes from the outside of the motor and choking it? Where exactly does this motor suck in the fresh air? I dont really see a opening for fresh air? And where does the exhaust come out at?Same place as the water spout?Also the lean/rich knob is missing,which would allow the adjustment to spin further than it should,so how would i know the origional adjustment range of the knob so i keep it within the safty zone. Other than that ,it runs excellent,responsive and smooth as long as the cowel is off.

 

[HighTrim]

Re: Evinrude problem.

Hopefully FR comes back on, he is very knowledgeable in the older motors.

 

[grid]

Re: Evinrude problem.

I'm not sure which seal you filled with water, but the exhaust is coming around the seal at the bottom of the clamshell (lower housing) just above where the gearcase joins. It's impossible to replace unless you remove the engine from the case, and somewhere along the line, after having done a few of these, I decided there wasn't enough Makers Mark in the world to do another. If you can figure some way to seal it from underneath, do it. if you can't achieve that, I've had some success--but not a great deal--drilling holes under the hand-hold at the top rear of the cowl, where the rotation of the flywheel will blow out some of the exhaust.

 

[F_R]

Re: Evinrude problem.

Ta-Dah-h-h, here I am.
Seriously, reading the questions, I get the feeling you are running it in a barrel. Is that correct? I can tell you flat out that those motors won't run in a barrel with the hood on.

Moving on, exactly what gasket are you talking about? The rubber flap in the middle? Unless it is very badly deteriated or missing, that probably is not the problem. Yes, it is true that on a boat, sitting ideling at the dock in neutral, smoke can come up through there. But in gear and under way, the smoke is left in the wake behind the boat.

There are several other culprits that can cause smoke to get under the hood. One very common problem is the rubber seal on top of the water pump housing. If that is left out, it will not run worth a hoot with the hood on. The second is a rubber boot on the shift rod. You can't even see that thing without opening it up. They rip and tear and let smoke go up into the hood. The third is the rubber bellows exhaust and water outlet behind the powerhead, if it is torn. Fourth is the exhaust covers on the side of the powerhead. They corrode a hole through the bottom. You can hear that one. Noisy exhaust.

Summing up, if you are boating in a barrel, get it in the water where it is designed to run. That may be the only problem. Then check for the seal on top of the water pump. Hopefully, you have found the problem by then.

 

[crazydrywallguy]

Re: Evinrude problem.

Yes i am boating in a barrel. I kinda wondered if that might be the prob,as there was a huge cloud of smoke surrounding the motor. Also the seal i was talking about is the seal that is a big oval shaped seal that is about 8 inches from the bottom of the motor,it appears that if it was bad could suck up exhaust fumes. I replaced the impeller and all the needed seals down there. How do i know where the lean/rich knob should be at since there isnt a knob on it. I dont want to run it too lean.

 

[crazydrywallguy]

Re: Evinrude problem.

Ok guys,i took the motor on the lake and it made a huge difference. The only problem is at real low idle it wants to missfire and stall. I just ordered a new low speed idle knob for it,but how do i know where the origional setting is supposed to be for the low speed adjustment since the knob has been missing? Thanks

 

[iwombat]

Re: Evinrude problem.

In order to set it, turn the adjustment all the way in until snug (knob off). Back off about 1.5 turns. Put the knob on and adjust until you find the fastest rpm. Then, back off 1/4 turn.

Take the knob off again, and put it back on so the pointer points to the center of the adjustments.