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KZ1000M very weak spark

  • Grantl
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10 Jul 2006 22:51 #60985 by Grantl
KZ1000M very weak spark was created by Grantl
Hi Folks,
I recently removed almost all of my ignition components in order to test them before deciding what I needed to replace. I checked most of them to the specs in the Clymer manual and couldn't detect any obvious faults. I then put it all back together and charged the battery (battery measured 12.6 volts prior to hookup.) When I tried to start the bike I noticed a very weak spark at cylinder #4(this was the only plug I disconnected to check for spark). The spark was so weak that it wouldn't jump at the electrode but jumped from the side of the ceramic to the outside edge at the threaded end of the plug. The manual says that a weak spark might indicate a partial short in the secondary windings of the coil (these are stock OEM coils). Is it possible that both coils shorted out at the same time? I should add that prior to all this, the bike was running but the battery had run out of juice and I tried to charge the Batt without disconnecting the positive lead. Is it likely that I damaged the coils by doing this? Thanks in advance for your input.
Grant.

1981 KZ1000 CSR
1983 KZ750 Project Bike
1990 550 Zephyr
1994 KZ1000 P

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10 Jul 2006 22:54 #60986 by EddieBoy
Replied by EddieBoy on topic KZ1000M very weak spark
are you sure its not a bad plug? have you tried a different one?

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10 Jul 2006 23:19 #60990 by steell
Replied by steell on topic KZ1000M very weak spark
I agree with the bad plug idea, it would also be a good idea to check the resistance of the spark plug caps.

KD9JUR

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11 Jul 2006 07:57 #61065 by Grantl
Replied by Grantl on topic KZ1000M very weak spark
Thanks for the tips, I'll check those out tonight and let you know.
grant.

1981 KZ1000 CSR
1983 KZ750 Project Bike
1990 550 Zephyr
1994 KZ1000 P

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11 Jul 2006 20:12 #61249 by Grantl
Replied by Grantl on topic KZ1000M very weak spark
Well, I gapped and installed new plugs and the bastard started right up--thanks guys. The problem now is that it will only run on choke and won't allow me to turn the choke all the way off. Any suggestions for this ailment?

1981 KZ1000 CSR
1983 KZ750 Project Bike
1990 550 Zephyr
1994 KZ1000 P

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12 Jul 2006 12:20 #61457 by wiredgeorge
Replied by wiredgeorge on topic KZ1000M very weak spark
Sure! Post a question about your choke issue in the carb forum.

wiredgeorge Motorcycle Carburetors
Mico TX
www.wgcarbs.com
Too many bikes to list!

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