eaglecrash2 wrote:
What would happen if you mix Accel coils(cdi type) with Martek 440 for a '77 kz650?
CDI coils are very low resistance. If you use them on a transistor-Kettering type ignition like the Martek 440, you blow up the ignition, and maybe even damage the coils.
Martek did make CDI ignitions for dirtbikes, but the Martek 440, I'm pretty sure, is not CDI. It's optical-triggered, transistorized-Kettering.
However, many people incorrectly use the term CDI. Most likely, if the coils are 3 ohms, then they are not CDI coils. They are regular electronic ignition (aka transistorized-Kettering) coils. They might work ok with the Martek 440. I don't know what the minimum resistance spec is for the coils used with the Martek, so it's hard to say if three ohms is too low or not (too high is ok). I have instructions for the martek440 I pulled off the internet, but I couldn't find the spec.
The Martek 440 unit I dealt with on a 77KZ650 was faulty. A quick search of forums shows people having similar issues to what I saw... intermittent spark. The one I tested with that symptom was toast.
If you have accel 3-ohm coils, then you should probably just get a Dyna S, or try to get an electronic ignition off an early 750-four.