'66 Johnson 6hp issues

[lexluger]

model# CDL-23E
serial# J2612746

I was wondering what the fuel mixture is on this motor.

I just replaced the water pump and housing and rebuilt the carb. It starts and runs for just a couple seconds then dies out. I set the idle adjustment just like the seloc manual states, but it was starving for fuel so I backed the needle valve out a little more and it runs for just a little longer.

Also, the pull start gears look to be made of plastic and do not seem to be holding up so well. Is there anyway to get a hold of a new gear for that?

Thanks

Ted

 

[Joe Reeves]

Re: '66 Johnson 6hp issues

Mixture is 50/1. The plastic bendix gear is available as a separate item, possibly at this site, surely at any dealership.

Best starting manner is to slowly have the bendix engage the flywheel teeth, then yank on it. Otherwise the teeth get pretty well banged up.

(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 1: 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.

Note 2: If the engine should be a three (3) cylinder engine with three (3) carburetors, start the adjustment sequence with the center carburetor.

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.

 

[lexluger]

Re: '66 Johnson 6hp issues

here is a little movie of how it is acting.

http://www.youtube.com/watch?v=OuyNyJtyCYs



Ted

 

[JB]

Re: '66 Johnson 6hp issues

If the engine behaves well while it is running, then runs out of gas you have a fuel supply problem, Lex.

Check fuel tank vent and pickup for restriction, fuel line for kinks or pinching and air leaks and finally, check the fuel pump for pumping.

In the Engine FAQs, "Outboard won't start" there is a procedure for troubleshooting the fuel suply.

Good luck.

 

[lexluger]

Re: '66 Johnson 6hp issues

Hello everyone I am back from a great Eastern Sierra trout opener trip and back to this nagging motor.

I opened the fuel pump and found a ripped diaphram, so I replaced the fuel pump and watched the perfect flow of fuel with the line disconnected on the new pump.

I try to start it up and the same thing, runs for a few moments and then shuts down. Next I backed out the high speed needle(which is a fixed valve with orifice plug) and found that it stayed running for a bit longer than before. It will run at very low throttle and act like it is going to die the entire time.

Anyone have any ideas this time?

here is another video of how it is acting

http://www.youtube.com/watch?v=AHAOk5VsqDA

and here is a video of it working after leaving the choke butterfly closed.

http://www.youtube.com/watch?v=5sq5klToEto

 

[jay_merrill]

Re: '66 Johnson 6hp issues

If the diaphragm in the fuel pump was disintegrating, you probably have junk in the carb again. Take it apart and clean it out. Make sure that you remove the expansion plug to clean out the passage leading from the low speed jet to the orifces in the top of the carb.

From watching your video, it seems to be that you are getting spark but are having a fuel delivery problem. Junk in the carb would cause what you are experiencing.

 

[lexluger]

Re: '66 Johnson 6hp issues

I never thought of that, but it makes complete sense. I will have to work on that one the next day off.

What do you guys think about it running only when the choke is out?

 

[F_R]

Re: '66 Johnson 6hp issues

Did you inspect that fixed orfice closely? It the orfice is precision sized and has to be absolutely clean. Any coating at all in the hole will make it starve for gas. Your backing it off some verifies it. That is letting gas flow around it instead of through it.