15 HP Evinrude still missing after tune up

[R Williams]

1979 15 HP model # 15954E
Completed tune up new coil paks, plugs, carb. kit, took flywheel off and cleaned contacts and a new fuel pump.
It runs better but I still have a miss that I cannot locate. All of the parts under the hood except for the ones I just listed are the originals form 79.
I have had suggestion of possible wires breaking down and going to ground from time to time. The miss is not regular but irregular instead. Before I sink money into a Magneto assembly and a power pak dose anyone have a suggestion of what to attempt first?

 

[HighTrim]

Re: 15 HP Evinrude still missing after tune up

Have you run it at night and attempted to see any arcing?

 

[Rick.]

Re: 15 HP Evinrude still missing after tune up

Some refer to a miss which is actually a sneeze. If it is a sneeze it is caused by a lean condition and the way to correct it is to wind your slow speed needle out (counter clockwise) 1/8 turn at a time until it goes away. If it has spark escaping to ground then I agree, night time is the right time to be with the motor you love. Now that was corny. Best of luck. Rick.

 

[oldcatamount]

Re: 15 HP Evinrude still missing after tune up

When you say you "cleaned the contacts", does that mean you filed the points? If you did, you would then need to re-adjust them. Not doing so could result in a "miss".

 

[R Williams]

Re: 15 HP Evinrude still missing after tune up

I did put a timming light on it so observe the firing. one cylinder seems to flash like it should but the other, every time I hear the miss the light misses the flash. I will attempt tonight to spot arching in the dark.
Good information on "sneezing" I never thought of that either. If it did sneeze would that cause a miss in fire that can be seen in the timming light?

Thanks for the responses, I can now go tinker some more with new information.

Rich

 

[oldcatamount]

Re: 15 HP Evinrude still missing after tune up

The lean sneeze is a carberator adjustment and has nothing to do with the ignition spark.

 

[Rick.]

Re: 15 HP Evinrude still missing after tune up

The lean sneeze is a carberator adjustment and has nothing to do with the ignition spark.

Agreed. Rick.

 

[R Williams]

Re: 15 HP Evinrude still missing after tune up

The contacts I am referring to is the brush looking things inside the flywheel that run around the other brush looking things on the magneto. I do not know what they are called so I referred to them as contacts. I may be wrong but I do not beieve this engine has points, contacts and condenser. Still working on it.

 

[Rick.]

Re: 15 HP Evinrude still missing after tune up

I don't think a 79 has points but I can't remember. Here are a couple of links yuo will find helpful to diagnose your problems.
For parts diagrams
http://epc.brp.com/SiteMods/BRP_Public/BRP_Public_Login.aspx?ReturnUrl=/Index.aspx
For general information.
http://www.sschapterpsa.com/ramblings/Ramblings.html

 

[bktheking]

Re: 15 HP Evinrude still missing after tune up

74-76 has points, probably referring to the sensor or the E designation referring to electric start in which case it's got a stator. If it is electric start disconnect the rectifier and restest, if the miss goes away replace the rect. Did the new coils come with wires? If not replace as well.