KZ1300 fouling plugs on 1 & 2...runnin' like crap!

Here is a link to the page for the "ProFire coils. nology.com/profiremotor.html

I'll ckeck out them coils...THANKS

From what I remember, those Nology mini-coils are very dwell-sensitive. Too much dwell and they'll burn up. Dyna makes similar mini-coils and have that warning. That is why you can't use them with a fixed-dwell system like the Dyna S.

The older Kaw factory ignition, like used from 79 through to 83 depending on the bike model, has a semi-fixed dwell. It varies from about 100deg to about 120deg, at least on the 4-cyl bikes. I haven't actually seen the 1300 unit in person. While it is better than a fixed-dwell, it's not as good as a true constant-energy ignition.

A constant-energy ignition will alter the dwell-angle by about a factor of 10... like 12deg to 120deg.

With a fixed dwell, at 1000 RPM you have 10 times the amount of dwell-time that you have at 10,000 RPM.

If the dwell is right for the Nology coil at high RPMs, it will be too long at idle using the Kaw ignition. If it's right at idle, it will be too short at high RPMs (which is fine if you are getting adequate spark). If the dwell is too long, the extra dwell time is just heating the coil. Large coils are made to handle this. Mini coils are not. Therefore mini coils must have their dwell precisely controlled. Obviously, there is a safety margin in the coil for heating, and probably the Kaw ignition falls into that margin, but there is still the possibility that the life of the Nology coil may be shortened. (I see you are using the 3.0-ohm Nology mini's. They are likely similar to 3.0 ohm Dyna coils in inductance so will likely behave similarly. The Kaw electronic ignition dwell is slighly short for those 3-ohm dyna coils, so likely it is short for the Nology coils too. That is, at least, on the safe side for the Nology's. If you happen to use my HEI mod, I think you can even get the idel-dwell down to 60 or 80 degrees. That will extend the life of the mini coils.



Because I want to use mini coils too (I found some new Dyna Minis, 0.5-ohm, for 1/2 price), I am working on a circuit to alter the dwell appropriately. This is easy when using the HEI modules. The .5-ohm mini coils obviously need a very short amount of dwell, compared to the 3.0 ohm versions.

I had a long discussion with Nology about it, and they assured me that the coils are fine. They do list them for the KZ1300 threw 1983 but not past that. Here is a link to the KZ1300 sight. nology.zn1300.com/

loudhvx wrote:

(I see you are using the 3.0-ohm Nology mini's. They are likely similar to 3.0 ohm Dyna coils in inductance so will likely behave similarly. The Kaw electronic ignition dwell is slighly short for those 3-ohm dyna coils, so likely it is short for the Nology coils too. That is, at least, on the safe side for the Nology's. If you happen to use my HEI mod, I think you can even get the idel-dwell down to 60 or 80 degrees. That will extend the life of the mini coils.



Because I want to use mini coils too (I found some new Dyna Minis, 0.5-ohm, for 1/2 price), I am working on a circuit to alter the dwell appropriately. This is easy when using the HEI modules. The .5-ohm mini coils obviously need a very short amount of dwell, compared to the 3.0 ohm versions.

Oops, I edited my post a little while you were responding. I checked out the coils you mentioned. I think you'll be ok since the KZ dwell is a little short at high RPMs for the 3-ohm coils. However, you might actually benfit from the HEI mod. It shortens dwell at idle more than the stock ignitor., while at higher RPMs, it still maintains the dwell at 120 deg.

I have no objections in making something better. I would be happy to try your mod.

I may start a thread on it as opposed to jacking this one anymore. I'll need more data on the pre-1981 pickup units for the 1300 to be sure it acts similarly to the twin/4-cyl units. (If I'm not mistaken, 81 and later had electronic -advance. Those would be very different, in regards to pickup signal.)