1971 Evinrude 50hp

[james28144]

My motor was recently worked on and had a new head gasket,temp. switch and thermostat along with new spark plugs installed.
I put it in the water and it would not run properly. I tried to adjust the screws on the carb, both at idle speed and while is was in gear moving across the water. The motor wont build up enough speed to plane out.
The carbs want to bog down and not idle smoothly. The engine has sat for the last 3 years.
I bought a bottle of fuel additive to help clear up the fuel lines and deposits that may be in the carbs.
I may need to have the carbs pulled and cleaned...and properly adjusted!
what should be done here..is there a possibility that the fuel pump may be clogged up?

 

[Joe Reeves]

Re: 1971 Evinrude 50hp

James..... Sitting for that length of time, I guarantee that those carburetors are fouled, clogged, and gummed. Remove, clean, and rebuild them with complete carburetor kits. Be sure to manually clean the fixed brass high speed jets that are located in the bottom center portion of the float chambers. After which, adjust as follows.

(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.

http://stores.ebay.com/Evinrude-Johnson-Outboard-Parts-etc?refid=store

 

[james28144]

Re: 1971 Evinrude 50hp

Thanks, I have sent it back to my mechanic and he's going to order a new carburetor rebuild kit and fuel pump kit. I believe that everything will run fine afterwards.

 

[tashasdaddy]

Re: 1971 Evinrude 50hp

i fnd it hard to believe, the mech didn't find that. did he run the engine after his work.

 

[james28144]

Re: 1971 Evinrude 50hp

the mechanic hooked the water to the motor and started it and let it idle for 15 or 20 minutes, he didnt do much else. He runs a small engine repair shop in his back yard....works on lawn mowers, dirt bikes, 4-wheelers, weed eaters ect....He just ordered the parts for the engine (head gasket, temp. switch, thermostat, spark plugs.) He did say that the carbs would probally need rebuilding. He suggested that I take in to the lake and try her out first.
I watch him rebuild a carburetor on a lawnmower...he knows what he's doing...thankfully. He has a manual on my engine and I believe that everything will be fine when he is completed.
Thanks for your help.

 

[tashasdaddy]

Re: 1971 Evinrude 50hp

that explains it. if it was a shop, i would be really pee'ved. there are more and more shops of the water. you can really test an engine on muffs. or in a tank.