120HP Looper ignition

[120HP Looper]

Hi. Don't know if anyone else has had this issue but here goes.
I have a 1985 120HP Looper.
It has strong spark on 3 cylinders but no spark on one.
If I swap one of the orange wires from another coil on to the dead cylinder I have strong spark so I know the coil is good.
I have done all the tests that the CDI trouble shooting info sheet suggests and also the trouble shooting tests in the Evinrude/Johnson manual.
The only thing I have found is that the orange wire connected to the dud cylinder reads a lower voltage when cranking than the other 3.
I have taken the flywheel, stator and timer base out and cleaned the all thoroughly.
There is slight pitting on two magnets on the flywheel and very slight pitting on the stator. I gave them a clean up with 1200 grit wet and dry sandpaper. I used WD40 as a lubricant.
Well that's it. Can't think of any thing else.
Cheers.
Oh, the plug and plug wire are good.

 

[Faztbullet]

Replace pack

 

[120HP Looper]

Replace pack

Thanks.
I'm thinking the timer base myself. It's pretty chewed up. Only 2 of the clamps were holding it in place.
I'll know more tomorrow after I've made a DVA/Peak Power reader tonight.

 

[racerone]

Test the sensor coil ohms.

 

[120HP Looper]

It's the power pack. I didn't find out through testing though.
I took the pack out and cleaned it up and I could see through the sealer the part that has failed. So frustrating. If I could get in there I'm sure I could fix it.
Took a couple of photos.
Thank you all for your help.

 

[paulwang]

Hi. Don't know if anyone else has had this issue but here goes.
I have a 1985 120HP Looper.
It has strong spark on 3 cylinders but no spark on one.
If I swap one of the orange wires from another coil on to the dead cylinder I have strong spark so I know the coil is good.
I have done all the tests that the CDI trouble shooting info sheet suggests and also the trouble shooting tests in the Evinrude/Johnson manual.
The only thing I have found is that the orange wire connected to the dud cylinder reads a lower voltage when cranking than the other 3.
I have taken the flywheel, stator and timer base out and cleaned the all thoroughly.
There is slight pitting on two magnets on the flywheel and very slight pitting on the stator. I gave them a clean up with 1200 grit wet and dry sandpaper. I used WD40 as a lubricant.
Well that's it. Can't think of any thing else.
Cheers.
Oh, the plug and plug wire are good.

Hello, how did you solve the problem eventually? I have similar problem. On a 3-cylinder 70HP Johnson outboard, only the bottom cylinder work properly. Switch coils and spark plugs, found they are good. The two bad top cylinders have weak and paused sparks.

 

[Crosbyman]

bad pack obvioulsly.. .couple of $2 parts pita to carve out and replace. :-(

 

[paulwang]

bad pack obvioulsly.. .couple of $2 parts pita to carve out and replace. :-(

Thanks Crosbyman. Will get a new pack and replace it.

 

[Crosbyman]

paul...my comment was in reference to 120lopper's pics. ... proceed as you see fit.

maybe do a visual on your own to see if you have a similar burn out

 

[paulwang]

paul...my comment was in reference to 120lopper's pics. ... proceed as you see fit.

maybe do a visual on your own to see if you have a similar burn out

Thanks!!