Johnson 9.9 gags, timing question too

[ba_50]

This motor is a '92 J10Rena with a manual starter.

I put a new carb cover kit on it along with a carb kit.

It idles ok but it won't get any kind of power unless you run it a full throttle for a bit and back off 1/4" then it moves right along although I'm not sure that the best it will do. If you back off it drops off to about 5-7 mph. I just cleaned the carb. What else could it be? I was wondering about a rubber tube in the float bowl that seems too long and has two curves in it. What does it do anyhow?

Where are the timing marks. This motor only has less then 15 hours on it.

Thanks.

 

[tashasdaddy]

Re: Johnson 9.9 gags, timing question too

did you remove and clean the high speed jet? it is in the bottom of the bowl and is easily clogged. #23 in diagram. http://shop2.evinrude.com/ext/index.aspx?s1=a6538c8b090c76e5ca325b3430fd4175 i do not see a rubber tube in float bowl.

read this: http://forums.iboats.com/showthread.php?t=244013

(Carburetor Adjustment - Single S/S Adjustable Needle Valve)
(J. Reeves)

Initial setting is: Slow speed = seat gently, then open 1-1/2 turns.

Start engine and set the rpms to where it just stays running. In segments of 1/8 turns, start to turn the S/S needle valve in. Wait a few seconds for the engine to respond. As you turn the valve in, the rpms will increase. Lower the rpms again to where the engine will just stay running.

Eventually you'll hit the point where the engine wants to die out or it will spit back (sounds like a mild backfire). At that point, back out the valve 1/4 turn. Within that 1/4 turn, you'll find the smoothest slow speed setting.

Note: As a final double check setting of the slow speed valve(s), if the engine has more than one carburetor, do not attempt to gradually adjust all of the valves/carburetors at the same time. Do one at a time until you hit the above response (die out or spit back), then go on to the next valve/carburetor. It may be necessary to back out "all" of the slow speed adjustable needle valves 1/8 turn before doing this final adjustment due to the fact that one of the valves might be initially set ever so slightly lean.

When you have finished the above adjustment, you will have no reason to move them again unless the carburetor fouls/gums up from sitting, in which case you would be required to remove, clean, and rebuild the carburetor anyway.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

Tashadaddy,

I remember that #23 going into the side of the nozzle. It looked clear and I shot carb cleaner through it. I'll have to do it again with a wire I guess.

The tube I referred to was an idle tube #4.

Even though I have soaked it in carb cleaner overnight, I didn't think it was recommended because it removes a green sealer from the carb body.

 

[tashasdaddy]

Re: Johnson 9.9 gags, timing question too

have to say #4 in a new one on me. all the carbs i have ever done had a metal pick up tube.

you have to remove that high speed jet. then blow out the hole.
i did a 6hp carb yesterday that looked pristine, until i took the high speed jet out.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

Tashadaddy

There were two chunks in the float bowl big enough to block the nozzle. Even with a gas filter and filtering the gas in the tanks, it still gets in there.

Having that nozzle down in the bottom was a bad idea.

 

[tashasdaddy]

Re: Johnson 9.9 gags, timing question too

they are all like that. you are due for new fuel lines, be sure to use the alcohol resistant fuel lines, ethanol breaks down the old ones, that could be your particles.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

They are new! Got it cleaned real good and will try for speed tomorrow.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

No go. it just picks up some speed above idle and thats all

Put two new plugs in and filtered the gas twice. Soaked the carb for 5 hours in Gunk cleaner, used wire and air compressor.

I don't think the timing has been tampered with. I've never seen anything like this.

 

[tashasdaddy]

Re: Johnson 9.9 gags, timing question too

did you try pumping the fuel line bulb, and see if it would pick up speed. that would lead to a weak fuel pump.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

Pumping the bulb didn't help. I took the hose off the carb and started the motor. It pumped but not as much as I expected, nothing like squeezing the bulb anyhow.

I won't start cold in the morning without spraying carb cleaner too.

 

[tashasdaddy]

Re: Johnson 9.9 gags, timing question too

spray premixed fuel, nothing else either and carb cleaner strips the lube off the internals. is your choke working?

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

Yes the chokd works ok.

I'm wondering that since the carb cover kit has a different style cam roller, could the adjustment screw be off enough to cause this problem?

What is a throttle shaft amplifier?

 

[Rick.]

Re: Johnson 9.9 gags, timing question too

Have you done a spark test with the motor warmed up? It is possible your running on only one cylinder. I've never heard of a throttle shaft amplifier. Rick.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

Since the choke wasn't letting it start I took the float bowl off and again there was a lot of black stuff in there. Enough to plug the jet.

I took a closer look at the main fuel line and really felt stupid. Even though it looks new, it might be the original line. I changed several lines but not this one. Hope this solves the problem.

 

[CharlieB]

Re: Johnson 9.9 gags, timing question too

1992

little black specks/flakes in the carb

alcohol in the fuel

Very closely inspect the fuel pump diaphragm for alcohol embrittlement/flaking.

These particles flake off and pass into the carb, clogging jets, sticking between the needle and seat. Generally causing carb problems long before the fuel pump actually fails.

Replace the diaphragm AND install a small in-line filter between the pump and the carb to prevent this from ever happening again.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

I never thought of putting a filter there before. Sounds great, except finding one for a 5/16" fuel line might be a problem.

The fuel pump was taken apart a few months ago and I didn't notice any flakes at that time.

Thanks.

 

[tashasdaddy]

Re: Johnson 9.9 gags, timing question too

i never rebuild a fuel pump, just one little thing can screw up the hole mess. inline filter is suppose to be before the fuel pump. alcohol resistant hoses.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

I tried running the motor at full throttle hoping it would clean itself out and that didn't work. There was a yellow piece of plastic stuck on the inside of the jet this time. 3 punches with a wire and it came out.

I tried 3 places and Ebay looking for a 5/32" inline filter and no luck. The 1/4" round and inline filters are too big to go between the fuel pump and carburetor.

The bigger Johnson fuel pump is easy to put a kit in. The directions are good. But the little square ones are tough. I need to put each part in line and put it back together the same way.

 

[ba_50]

Re: Johnson 9.9 gags, timing question too

I cleaned the carb and put a new 1/4" fule line and filter between the fuel pump and carb. No change.