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z1000 ignition

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22 Apr 2006 07:00 #41628 by battymatty
z1000 ignition was created by battymatty
hi,restoring a 1980 kz1000 ltd, its been standing for 6 years, after thourough carb cleaning and fresh fuel its still running badly, i now supspect a weak/ intermittant spark causing bogging and missing at higher revs when under load.
All cylinders fire and i can see a small yellow spark on all four plugs so i assume the pulse coils and ignitor are fine, and im getting around 11.5 volts at the coils (drops to about 9 volts when running)i think this is high enough voltage- i assume the only things left are the coils themselves, ht leads and caps, are there any suitable tests for the coils that can be performed on a basic multimeter, cheers- mat

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22 Apr 2006 08:24 #41641 by OKC_Kent
Replied by OKC_Kent on topic z1000 ignition
battymatty wrote:

hi,restoring a 1980 kz1000 ltd, its been standing for 6 years, after thourough carb cleaning and fresh fuel its still running badly, i now supspect a weak/ intermittant spark causing bogging and missing at higher revs when under load.
All cylinders fire and i can see a small yellow spark on all four plugs so i assume the pulse coils and ignitor are fine, and im getting around 11.5 volts at the coils (drops to about 9 volts when running)i think this is high enough voltage- i assume the only things left are the coils themselves, ht leads and caps, are there any suitable tests for the coils that can be performed on a basic multimeter, cheers- mat


You should be getting 12volts all the time.
You seem to be a prime candidate for the WG coil mod. Go to the KZ INFORMATION tab, click FILEBASE and look for the mod.

Good luck and have fun

Oklahoma City, OK
78 KZ650 B2 82,000+ miles

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22 Apr 2006 16:51 #41709 by pidaster
Replied by pidaster on topic z1000 ignition
spark should be blue not yellow.

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23 Apr 2006 03:59 #41803 by battymatty
Replied by battymatty on topic z1000 ignition
hi again, just been checking out my electrics to try and get to the bottom of this, have found that charging system is functioning correctly, but still found that coil voltage is dropping to 9-10 volts whilst running,
i traced back the power supply to the coils to a resistor + heatsink under the tank if i bypass this i get a good 12 - 12.8 volts at the coils and now a faint blue spark (still v. small but better than the yellow one i was getting before)- there is an improvement in running but not that much - still misssing, bogging and backfiring- i have replaced the ht leads, so im hoping a set of replacement coils should sort the problem, however im worried that by bypassing this resistor i may overload the coils- any ideas/ comments , cheers- mat

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23 Apr 2006 08:00 #41817 by roy-b-boy-b
Replied by roy-b-boy-b on topic z1000 ignition
Do the coil mod as mentioned in a earlier post. The bike will come alive. Roy

1979 LTD Street Fighter.1977 KZ1000

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23 Apr 2006 08:00 #41818 by roy-b-boy-b
Replied by roy-b-boy-b on topic z1000 ignition
Believe me! Roy

Post edited by: roy-b-boy-b, at: 2006/04/23 11:10

1979 LTD Street Fighter.1977 KZ1000

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23 Apr 2006 08:58 #41828 by battymatty
Replied by battymatty on topic z1000 ignition
cheers roy, i will get onto the coil mod next, first i think ill try running 12v direct from the battery to the coils, to test if it works before i invest in a relay and the extra wiring, hoping this will sort it....
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23 Apr 2006 09:25 #41837 by indykaw77
Replied by indykaw77 on topic z1000 ignition
As one who did the coil mod....it's WELL worth whatever the relay and some wire and connectors and solder cost's.
Night and Day difference.......so if you need help when you do it...post up and we'll get ya there....
Goods looking bike...:)

Kawasaki Motorcycles...because cars lean th wrong way!

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23 Apr 2006 12:25 #41871 by battymatty
Replied by battymatty on topic z1000 coil mod
just tried coil mod- but no change, as i said before 12 volts or near (same as battery voltage) is reaching the ballast resistor and in turn the coils, but with the engine firing this drops to 9-10 volts at the coil - this happens with the standard setup or the mod -both giving a weak spark, if i bypass the ballast resistor i get 12 - 13 volts at the coil and a slightly better spark, however im worried about burning out the coils, why does the resistor drain power when the engine is firing + is there any function to the resistor other than protecting the coils from overload, im still thinking i may have an insulation failure on the coils/ht leads, i may silicone the whole lot this week to find out, again any comments atall greatly appreciated.
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