Johnson V4 85 Keeps blowing cdi units

[spybot]

I have my 85 running just but it keeps dropping the two starboard cylinders
Each time it has blown the cdi unit.
I have checked the eartrhs of the coils plus the cdi unit there selves.
Is there any thing else i should be checking for.
This has been four cdi units in the space of two weeks
Please help on this as there are only limit to how many cdis i can go through.

[flabum1017]

Check the stator voltage, I've seen stators put out too much and fry powerpacks........

[moldman]

Check your rectifier.

[spybot]

Ok so after a day of trouble shooting found out that I have a defect timer base. This has been the fault

[racer]

What did you find on the timer?

[spybot]

While checking the ohms on the 4 wire connector I found that one of the wires was not giving a reading. I checked that it was not shorting or broken. This was the reason I was not getting a spark on the starboard side. I have to check the cdi units that I have taken off just in case they haven't been blown. Just goes to show look at all things in detail and don't think of one cause and stick with that

[racer]

Broken wire will do it, when they break most often right at the pin going into the plug.

[spybot]

Yeah i checked there but nope it was ok there
The break must be right at the base. I checked the continuity from just under the base but got a reading so the fail is in the timer
I didnt figure on that blowing CDI but i guess it was just luck that it started working again when i put on the new CDI
Well i have leaned from this and hope others have as well

[flabum1017]

Timer base wires break from being work hardened. It's always best to check everything when diagnosing. My rule of thumb has always been to do the basics: compression, spark and fuel. Check them all first, then dig in.