Johnson coils

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I am working on a 6 hp Johnson, 6R75 R. I removed the flywheel to inspect condition of coils, pints, etc. I have two different coils in here, one is a 510961 and the other is a 583249. Can anyone tell me the difference in them if any or if one is a replacement for the other? The 510961 is green in color and the 583249 is black.

edit: Do you folks have a preference CDI, Sierra, or Mallory ignition parts?

 

[Joe Reeves]

Re: Johnson coils

The numbers you list (neither one) are listed in the Bombardier parts book.

The original part number of the coils are 580971 but have been superseded up to 584477.

 

[reload]

Re: Johnson coils

OK so it looks like someone just used whatever coils were laying around and put them in. Anyway they worked. One set of points were dirty causing trouble. Runs great in test tank. Searching around it looks like the 583249 was from about 10 years earlier.

 

[Joe Reeves]

Re: Johnson coils

I've always been fairly good with part numbers.... that 583249 doesn't ring a bell at all.

 

[reload]

Re: Johnson coils

It looks like it was original equipment on something called a Lark.

 

[schematic]

Re: Johnson coils

Do you folks have a preference CDI, Sierra, or Mallory ignition parts?

Sierra has lifetime warranty. Iboats sells them

 

[reload]

Re: Johnson coils

Lifetime warranty, that's impressive. I wonder if they will make good an old coil I removed without receipt.

 

[F_R]

Re: Johnson coils

510169 is a breaker cam.

 

[reload]

Re: Johnson coils

OK I've this thing running fairly well. I took it out crabbing Saturday and it runs fine at all speeds except idling for a long period. Running the line, it will, without any warning, just stop running. I have to pull the choke and it will start right back up. I find if I keep it just above idle it will run fine, but of course that is to fast to run the line.

Also I notice when it sits not running with the sun beating on the tank, it will start to leak fuel out the housing as the pressure builds in the tank. Is this normal, never noticed it with any of the other tanks or motors?

 

[Joe Reeves]

Re: Johnson coils

Pertaining to post #9................

Remove, clean, and rebuild the carburetor, then 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.

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.

 

[reload]

Re: Johnson coils

Joe,

Thanks for the reply. I'll try this.

Paul