Carb and Fuel System Trouble

[pamlicobeach]

I have a 1990 Evinrude 115. I have cleaned and rebuilt the carburetors using the information in the manual and this forum. The rebuild went real well, I followed the instructions to the letter.

With the carbs back on, I am still seeing a problem. The engine will not idle below 2500 RPM. It seems as if the engine when it runs, is running solely on the fuel supplied by the primer solenoid. I am not sure it is disengaging.

With the engine running, I can flip the red lever on top of the solenoid and the engine will shut down right away.

What would cause this? Could there be some blockage in the fuel lines leading up to the carbs? Have I missed something?

Any suggestions would be appreciated.

 

[tashasdaddy]

Re: Carb and Fuel System Trouble

the lever on the primer should be turn back over the body of the solenoid. this is the normal postion operating postion. you activate it by pushing in on the key. the other postions are to use if your battery is dead and you have to rope start the motor. it should be like this. any other position, it allows fuel, thru, and will flood the motor.

 

[pamlicobeach]

Re: Carb and Fuel System Trouble

Thanks for the confirmation on the red lever on the solenoid. It is set to point along the body of the solenoid. I am going to check to make sure it is disengaging. I am still having trouble getting it to run smooth.

 

[tashasdaddy]

Re: Carb and Fuel System Trouble

have you done a complete linc n sinc, with the remote cables disconnected?

 

[pamlicobeach]

Re: Carb and Fuel System Trouble

No I have not. I was very careful not to change any adjustments when I took the Carbs off, however I am sure there could be some changes. I'm going to take a look at that. Any guidance on the link n sync process?

 

[tashasdaddy]

Re: Carb and Fuel System Trouble

step by step, per the manual, if you miss a step, go back to the beginning.

 

[5150abf]

Re: Carb and Fuel System Trouble

Had a similar problem on my 50, turned out to be a blockage in the internal fuel passages in the carb,jets were clean but not getting gas, I have found just cause you clean them doesn't mean they are clean.

Pulled jets and used copper wire and a can of air to blow everything out, pay special attention to the pick up tubes that go into the float bowl, I think the tube inside the tube was blocked.

Do the link and sync and if that doesn't get it clean the carbs agian using the air and wire and some Deep Creep, your idle circuit might be blocked on one or more carbs.

 

[pamlicobeach]

Re: Carb and Fuel System Trouble

I ran wire through the jet tube when I cleaned the carb. As best I could tell, everything was clean and free.

 

[5150abf]

Re: Carb and Fuel System Trouble

Ya, I meticulously cleaned mine 3 times and it still wouldn't idle.

I ran the wire through the internal passages of the carb and then blew it out with the can of air confirmiing air flow from through the carb.

 

[pamlicobeach]

Re: Carb and Fuel System Trouble

What confuses me th most on this engine is that it will not run slower than 2500 RPM. The throttle position is set at idle, both carbs have the throttle plates closed, but it will not slow down.

 

[ezeke]

Re: Carb and Fuel System Trouble

Clamp the fuel line to the primer solenoid and see if it slows down..

 

[emdsapmgr]

Re: Carb and Fuel System Trouble

Is the spark advance arm still attached between the spark control lever and the timer base? Possible the arm has come out of the ball socket and that you have too much idle timing. Make sure the top carb roller and sleeve has no pressure on it at idle. Also, that both carbs are absolutely closed at idle. If you are not sure, check the roller screw adjustment on the top carb. I'd follow tas's advice on using the manual to adjust the sync and link.

 

[5150abf]

Re: Carb and Fuel System Trouble

Mine did the same thing because the idle circuit was plugged so it wouldn't get gas till it could draw from the mid range jets, ran like a champ every where else, just wouldn't idle, chased it for 3-4 weeks before I got it.

 

[pamlicobeach]

Re: Carb and Fuel System Trouble

Thanks for all the help folks. Looks like I have it running good now. I went back through the carb and reset the float position (dropped it lower). I also found a broken drain system hose behind the carb. Not sure what if any impact the drain system hose may have had.

I have had some other issues crop up so I'll start a new post on that.