Force 125 1251x6a Top two cylinders not firing

[BL4266]

Hey thanks in advance for any help. As stated I have an 86 force 125 the top two cylinders are not firing bottom two are firing fine i'm at a loss most of the posts here describe one cylinder out Thanks

 

[roscoe]

Re: Force 125 1251x6a Top two cylinders not firing

Welcome to iboats.

Your motor's ignition has 2 cd modules , each module provides spark to 2 cylinders.
If one module goes bad, 2 cylinders have no spark.

It COULD be a couple other issues, but the odds are on the cd module.

To verify, Label all the wires on the 2 cd modules, then take a digital photo and make note of all the wire locations and colors.

Remove the 2 cd modules, swap them with each other, then re-attach all the wires.
If the cd module for the top 2 cylinders was bad, it will now be hooked up to the bottom 2 cylinders.
Check for spark, if there is now no spark on the lower 2 cylinders, replace the cd module with a new one.

Post back with your results.

 

[shytownborn]

Re: Force 125 1251x6a Top two cylinders not firing

you got excellent advice from roscoe, but also check your stator it also provides power to cd modules, you have three parts that provide power, one to the rectifer to charge the battery, and the other two parts for the modules that will provide power for each mod that controls two cylinders apiece, if you got a bad section of the stator thats bad it wont provide voltage to the mod, dropping two cylinders