KZ1300 fouling plugs on 1 & 2...runnin' like crap!
- otakar
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74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- fullbore
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- loudhvx
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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.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- otakar
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- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- loudhvx
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(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.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
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- otakar
- Offline
- User
74 Z1-A stock
76 KZ-900 Totaly stock vice MAC pipe
77 KZ-1000A stock
78 Z1-R 100%MINT 500 original Mi.
78 Z1-R Yoshi 1103 kit stage 1 cams Yoshi pipe. Etc
79 KZ-1300 (1400)
80 KZ-1300
81 Scratch built GPz1150R
82 KZ1000
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- loudhvx
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- KZr Legend
- Posts: 10868
- Thank you received: 1616
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.
Please Log in or Create an account to join the conversation.