End of my rope

[1dbo]

I have A 1977 JOHNSON 55hp when you first take it out it runs great as long as you don't shut it off an let it sit for more than 15 min. If you do it will start right up but as soon as you put it in gear it will stall every time.
After a while if you baby it enough you can get it going again and it will run fine you can shut it down for a minute or two and it will start and work fine.
But you better not sit for more than 10 or 15 minutes or you will be stuck.
Has anyone ever heard of this happening .

 

[jtexas]

Re: End of my rope

Stuck until when?

Fuel line holding pressure?
Tank vent open and clear?
Fresh fuel, free from water/debris?

Likely cause: worn carb float valves, let fuel seep through when you stop, flooding the motor.

Compression test first.
Next, spark test (not a "spark plug" test): get an inline spark tester (couple bucks at autozone), set the gap for 7/16", clip it to the engine block, attach the plug leads (one at a time) and look for a strong blue spark while cranking. If it can't jump a half-inch gap in the open air without a spark plug, it's not firing in the hole under heat & compression.

Assuming good compression and spark, rebuild the carb, install new carb kit.

See the "carb cleaning" thread in the "Engine FAQ" section of iboats.

 

[1dbo]

Re: End of my rope

If it sits all night it will be fine the next day. Fuel is holding good pressure.Tank vent open and fresh fuel in it. Carbs have been gone through twice including new floats. I also put in a new fuel pump. Tried shooting fuel in carb when you put it in gear it just flooded the motor so I am assuming there is fuel in the carbs an they are not running dry. I have also changed the impeller and the thermostate
thinking it my be getting to hot but that did not help.
Compression is 150 lb. in both cyclinders.
I did do a spark check and the spark looked weak to me and it would come and go on the #1 cyclinder I ordered 2 new coils they should be here tomorrow.
Thanks for trying to help me I am about to give up on this one.

 

[jimdd810]

Re: End of my rope

You have week spark i would first check all the connections and ground make sure they are clean and right. The next suggestion i would recommend is getting a good oem manual for your motor and go through the ignition test proceedures

 

[1dbo]

Re: End of my rope

Well still no luck I put both new coils on and and a new power pack.
Boat ran great when I took it out today so I shut it down for 15 min
Same problem started right up but as soon as I put it in gear it stalls
Now I am back to the fuel system. I noticed that when you go to give it some throttle it will stall out but if you put the manuel choke about half on it will speed up ok making me think its not getting enough fuel.
I took the fuel pump off and there was about a half a teaspoon ran out
I'm not sure but I would think it should be dry and maybe the diafram in the pump could be leaking back into the cyclinder and causing a low fuel start
and makeing it start lean.
Any help would be great

 

[jimdd810]

Re: End of my rope

usually when a fuel pump goes it will not usually run at all. I think you need to do a good carb overhaul complete with new floats. that should get you on your way good luck

 

[1dbo]

Re: End of my rope

I took it to the marina this spring and had the carbs cleaned and rebuilt and he did put new floats in also.

 

[jtexas]

Re: End of my rope

If you flood a warm motor with gasoline by choking it, it should die immediately. When it doesn't, it's because fuel isn't moving from the carb bowl into the cylinder.

If the pump wasn't pumping, there would be no gas in the carb bowl, so choking it would have no effect.

If the pump was leaking down into the cylinder, choking it would just flood it further, killing it.

The only possible cause for a condition that makes a warm motor run better with the choke on, is a blockage in the carb jets.

Doesn't matter when they were last rebuilt, or by whom.

 

[jimdd810]

Re: End of my rope

I agree with jtexas. Somtimes things get sucked in there and with ethynol gas around it could be parts of your fuel line getting in there. Take the carbs apart and clean them and chase all the fuel circuits and im sure your problem will be solved. Im willing to bet my good bird dog Chance on it. Well maybe not my dog but willing to bet my wife on it lol

 

[nymack66]

Re: End of my rope

Its an electrical issue I think since it heats up then fails ..Question how do you shut down abrupt stop for idle foe a minute then shut off? Also re-start you let it idle for while and then try to shift in to gear ?

 

[1dbo]

Re: End of my rope

I took the carbs apart and they were clean no sign of anything.
Float level was good. rechecked compression 150 in #1 152 in #2
voltage checked good.I'm going to take back out on the lake
and check voltage at stator when good and hot to see if it changes.

 

[jtexas]

Re: End of my rope

It doesn't matter how clean the carb looks -- you can't see into all the parts where fuel has to move through.

Did you pull the jets? Remove the core plugs? Soak 'em overnight?

Didn't you say the motor runs better with the choke on? Engaging the choke won't make the motor run if the stator fails.

Remember, your motor gets its lubricating oil from its fuel. Because the motor is starved for fuel, it is not getting enough oil.

Running it like this is guaranteed to result in catastrophic engine failure.

 

[mamm7215]

Re: End of my rope

Keep us posted...

 

[Sixmark]

Re: End of my rope

You can lead a horse to water.........

 

[1dbo]

Re: End of my rope

Well what do ya know. I changed the stator and put new plug wires on those new coils I just bought from johnson. And she runs great no more stalling when you put it in gear she goes now. Thanks for all your help

 

[jonesg]

Re: End of my rope

And the weather cooled down, vapor lock went away.

 

[1dbo]

Re: End of my rope

Weather still in the 90s here.

 

[nymack66]

Re: End of my rope

Sweet , thanks for the update ...

 

[1dbo]

Re: End of my rope

Will now that I have it running good. A new problem poped up this weekend.
Some how the gasket in the fuel pump came apart and totally pluged up my bottom carb. Well I took both carbs apart and got them cleaned out again and replaced the fuel pump with a new one. My question is can I put a fuel filter in between the pump and the carbs to keep this from happening again?
And if it did start to plug that filter would it make my engine run to lean
an cause damage to it.

 

[nymack66]

Re: End of my rope

The only place for a fuel filter rated for your engine is before your fuel pump not after.
The filter used must be rated for a 2 stroke engine and pre-mix fuel if you do so now.
Always use Marine Formula STA-BIL year round here are the benefits including the issue you just mentioned.

* America's #1 Selling Marine Fuel Additive Brand!
* BEST Ethanol Problem Fighter
* More than FOUR TIMES the Fuel System Cleaner than in Regular STA-BIL
* DOUBLE the corrosion preventer than in Regular STA-BIL
* Prevents corrosion from moisture & ethanol-induced water attraction
* Improves marine engine performance YEAR-ROUND, not just for seasonal storage