67' 9.5 has trouble.

[thx997303]

Okay, so I thought that I had fixed the problem with my motor.

I went out fishing yesterday. That was an outing I'll tell ya.

Anyway, the lake was getting a bit choppy, and I had been trolling all day, and my engine just decides to die.

Now, while trolling, the engine would idle smoothly, but about every minute or so it would misfire. Pop whatever you want to call it.

That wasn't an issue, it idled for hours like this.

But once I had trolled across the lake at the end of the day, the motor died.

It would start to die, and seemed like when I squeezed the primer bulb, it would run a bit better for a second, but would still die.

I wonder if it might not be the fuel pump.

It would run just great at WOT and mostly anything above idle, but just wouldn't idle.

The low idle screw didn't change anything.

So, I'm still chasing this problem down it seems.

And just for history, I have done these repairs.

-Changed plugs.

-New condensers, and breaker points.

-Carb rebuild.

-Compression is even on both cylinders at 60 when using the pull rope.

-New filter screen and gasket.

 

[thx997303]

Re: 67' 9.5 has trouble.

This pic is what both of the spark plugs look like.

And this is a pic of a gasket at the base of the powerhead. It appears to have oil on it.

The engine appears to need a decarb, but isn't horrible.

Plugs are gapped to .030"

 

[F_R]

Re: 67' 9.5 has trouble.

If it continues to run while you are squeezing the primer bulb, it indicates a fuel pump problem. But don't jump to conclusions, it could also be an air leak anywhere between the pump and the level of the fuel in the tank. Even a tiny leak will admit bubbles, which will interfere with the operation of the pump. It is a fairly good gas pump but a lousy air pump.

 

[thx997303]

Re: 67' 9.5 has trouble.

If the cap in on my tank looks like the pic below, could it cause an issue?

Could my leaky primer bulb also be an issue?

 

[ezeke]

Re: 67' 9.5 has trouble.

Are you mixing your gas/oil at 50:1?

What kind of spark plugs are you using?

If the tank is empty, which is what the gauge says, yes.

The main thing is that the tank needs a vent.

 

[thx997303]

Re: 67' 9.5 has trouble.

I am mixing the gas 50:1

The plugs are Autolite 353 which is the one that comes up when they searched for A21X which is one of the plugs that it says to use on the outboard.

The gas guage is on empty because the tank is sitting on end and not flat as it would during use.

It currently has about 5 gallons in this 6.6 gallon tank.

I was wondering more about the fact that it has a gaping hole in it.

And as I said, the primer bulb I have is leaky.

To expand on that, it leaks a bit at the motor end of the primer bulb when I prime it.

 

[CATransplant]

Re: 67' 9.5 has trouble.

Get a new fuel hose with fittings. Install it. If your bulb and your connector are leaking, air can be getting into your fuel lines. It's easy to drop in and buy an entirely new fuel hose, bulb and fittings. Lots better that trying to make do with an old worn out one. Try that and see if your problem doesn't go away. If the problem still exists, check the fuel pump.

http://www.iboats.com/3-8-Fuel-Line...9187666--**********.369482768--view_id.215298

 

[thx997303]

Re: 67' 9.5 has trouble.

I will try that.

We'll see what happens.

 

[Rick.]

Re: 67' 9.5 has trouble.

You really have to remember how flammable gas is and you don't want gas in your boat that isn't in a hose or tank. You say it runs fine at WOT which makes me think it isn't a fuel pump problem. I would suggest you use the right Champion plugs as well. Fix that fuel leak and let us know what happened from there. Best of luck. Rick.

 

[thx997303]

Re: 67' 9.5 has trouble.

This one is really getting to me.

The only parts of the ignition system that isn't new is the coils and plug wires.

Can't understand why a plug that is suggested by the manufacturer would be an issue, but I'll try using the Champions.

It's running characteristics do not change with the cowl on or off. So it's not an exhaust issue.

The bulb was soft when it was giving me the problem, and pumping it helped momentarily.

I'm going to go bald because I bought a boat

 

[thx997303]

Re: 67' 9.5 has trouble.

I looked at the fittings on my hose, and the one that goes to the motor has a crack inside the fitting where the little check valve is.

Leaks there no doubt.

Leaks at the primer bulb.

And the fitting that goes to the tank is cracked.

So, I may just have a fuel delivery problem related to this.

New hose and fittings will go on it today.

See what happens.

 

[CATransplant]

Re: 67' 9.5 has trouble.

Good move. Both of those things could cause the problem, and you'll have to replace the hose and fittings anyhow, so that's a good thing to try.

 

[thx997303]

Re: 67' 9.5 has trouble.

I'm about to test run the engine with the new fuel hose, but I just wonder, How does that spark plug look to you guys?

Lean? Rich? Just curious.

 

[thx997303]

Re: 67' 9.5 has trouble.

Okay, engine didn't improve.

The engine didn't circulate water through it when I was using the motor cuff I just bought, but did when I put it in a tank, so will be returning that cuff.

Anyway, the motor didn't run better, it still has trouble idling.

I noticed that if I half choke the motor, it runs much better. So I backed the idle mixture screw out as far as I dared. Didn't change a thing.

I also now know that there is a leaking gasket in the exhaust box or whatever you call it.

 

[thx997303]

Re: 67' 9.5 has trouble.

Is it possible that a leak in one of the gaskets on the exhaust box could cause my problems.

 

[Lion hunter]

Re: 67' 9.5 has trouble.

How far did you back out the screw? Where is the exhaust box? May need a pic of that. 1.5 turns out is a good place to start on the mix screw but my 9.5 liked about 2.75 turns out. That plug looked lean to me but it would be if you were sucking air. How does it look after the hoses were replaced? Are you judging the idling setting by the mark on the handle? The idle adjustment will back out far enough to kill the motor if the handle is turned all the way off.

 

[thx997303]

Re: 67' 9.5 has trouble.

The idle screw was at least 4 turns out, probably more. I was afraid I would make it fall out were I to turn it farther.

And I did start at 1.5 turns out.

I am judging idle by ear. Seems it should run around 800 to 900 rpm. Really need a tach.

Maybe my ear is broken and it's idling just fine.

The exhaust box is actually the Exhaust cover according to the below linked diagram.

http://shop2.evinrude.com/cgi-bin/I...06\06.tif&ilSC=15&ilIV=0&ilBR=0&ilIF=P&ilRE=8

Maybe it works, maybe it don't. Links suck.

Anyway, it would be the bottom of the intermediate exhaust cover gasket that appears to be dripping water.

 

[Rick.]

Re: 67' 9.5 has trouble.

Well I would suggest a re-cleaning of the low speed circuit of the carb.. Take a close look at the end of your needle as well to make certain it is in good condition. You could be sucking air in through the packing gland of the slow speed needle as well. Rick.

 

[Lion hunter]

Re: 67' 9.5 has trouble.

^^^^^^+1 on what Rick suggested. And if the bypass plate is leaking it can cause a loss of compression which will lead to poor performance. I would replace the gasket. Any "leak" on a motor is either sucking air or blowing it out. Either way it effects performance of the motor.

 

[Rick.]

Re: 67' 9.5 has trouble.

I forgot about the bypass cover. I agree it should be repaired. One time I had mine leak on a 9.9 and I was able to fix it just by snugging up the bolts. I would have had to pull the power head to replace the gasket. I'm not sure if the 9.5 would require the power head removal or not. Rick.