1972 Johnson 6hp running issues

[keller346]

I have an issue keeping my motor running. I have to push and pull the choke when it starts going dead. It runs fine for a few minutes then starts again. I have posted a video on youtube showing what it does.

http://www.youtube.com/watch?v=839iCfkoLOM


I wanted to try and go out tomorrow.

 

[ezeke]

Re: 1972 Johnson 6hp running issues

The carburetor is fouled; you should consider rebuilding it with a kit.

 

[keller346]

Re: 1972 Johnson 6hp running issues

They rebuilt it at the Johnson place along with replacing the fuel lines and filter, and replaced the plugs and boots also. So could it be something else or did they screw it up?

 

[ezeke]

Re: 1972 Johnson 6hp running issues

Generally, when an engine speeds up if you pull the choke, it indicates that the fuel/air mix is too lean (short on gasoline).

If the carburetor is clean, you may need to reset the slow speed needle (15). Turning it clockwise increases the amount of fuel in the mix.

It's more likely that the high speed jet (27) is fouled. It's behind the drain plug in the float bowl, where it picks up any trash that falls to the bottom. Sometimes you can flush it by taking the plug out and squeezing the primer bulb a couple of times.

 

[keller346]

Re: 1972 Johnson 6hp running issues

Generally, when an engine speeds up if you pull the choke, it indicates that the fuel/air mix is too lean (short on gasoline).

If the carburetor is clean, you may need to reset the slow speed needle. Turning it clockwise increases the amount of fuel in the mix.

That is that the black knob on the front of the engine at #17. I turned it but it didn't make any difference any way I turned it.

It's more likely that the high speed jet is fouled. It's behind the drain plug in the float bowl, where it picks up any trash that falls to the bottom. Sometimes you can flush it by taking the plug out and squeezing the primer bulb a couple of times.

I will try this also

 

[keller346]

Re: 1972 Johnson 6hp running issues

How would I go about resetting the needle?

 

[keller346]

Re: 1972 Johnson 6hp running issues

well i turned the needle all the way in gently and backed it out 2 turns. no change, if anything worse. I tried the drain plug that you showed me and gas did come out but not very fast or strong like i thought...i thought it would shoot out.

http://www.youtube.com/watch?v=WldO1cA49eM

It does not run very long at all now maybe a few seconds before it dies.


Oh and I did the carb ajustment in the TSF area also.

 

[ezeke]

Re: 1972 Johnson 6hp running issues

You should just get the rebuild kit and service the carbuetor if those did not help.

It's a lot easier to do with a factory service manual.

 

[keller346]

Re: 1972 Johnson 6hp running issues

Thanks for the help...gonna rebuild it and just ordered the kit

 

[keller346]

Re: 1972 Johnson 6hp running issues

ok with the rebuild done it is running fine. However it does seem to be underpowered. Me(225lbs) and my son(165lbs) in a 12 ft alum jon could not get on plane. I am thinking I either need a bigger motor or something is wrong with this one. Leaning more to something wrong because the 1967 5.5 could put me and a friend(300lbs) and get on a plane.

 

[bktheking]

Re: 1972 Johnson 6hp running issues

Check for spark on both cylinders, check compression while your at it.

 

[ezeke]

Re: 1972 Johnson 6hp running issues

See if the props on the 5.5 and 6 are the same pitch.