Lights dragging down Idle.

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16 Oct 2005 10:05 #2068 by aproud1
Lights dragging down Idle. was created by aproud1
Hi there. like the way the new site looks. Anyway finally have my 76 KZ400s running well enough to ride around town(just in time for the cold weather). For some reason when my lights (turn or brake) are on its dragging down my idle. What would cause this to happen? At least it runs. I'm going back out for another ride.

aproud1

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  • Biquetoast
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16 Oct 2005 10:19 #2070 by Biquetoast
Replied by Biquetoast on topic Lights dragging down Idle.
aproud1 wrote:

Hi there. like the way the new site looks. Anyway finally have my 76 KZ400s running well enough to ride around town(just in time for the cold weather). For some reason when my lights (turn or brake) are on its dragging down my idle. What would cause this to happen? At least it runs. I'm going back out for another ride.

aproud1


I've always had this problem myself on my 750#1. And, while troubleshooting other stuff through the years, I have been reducing this problem.

I have found that on *my* bike, it's because of old, corroding wiring connections.

Every time I work with some connection, I cut and solder it, eliminating bullet connectors.

Next I'm going to do "the coil mod" that's so well known around here....

(1.) '75/'76 KZ400D - Commuter
(2.) '78 KZ750B3 Twin - Commuter
(3.) '78 KZ750B3 Twin - Commuter
(4.) '75 KZ400D - Sold
kz750twins.com

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16 Oct 2005 19:48 #2228 by GargantuChet
Replied by GargantuChet on topic Lights dragging down Idle.
Not well known enough, apparently. Any info on the coil mod (what it is, why and how to do it, etc.)?

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16 Oct 2005 20:25 #2238 by Johnno
Replied by Johnno on topic Lights dragging down Idle.
GargantuChet wrote:

Not well known enough, apparently. Any info on the coil mod (what it is, why and how to do it, etc.)?


All the answers to your questions lie in this document. :)

kzrider.com/component/option,com_docman/...ls/gid,106/Itemid,5/

The coil mod is a good idea if your noticing a decrease in idle when turning on your lights. I second Biquetoast's recommendation about the electrical system in general. On older bikes, the connections get corroded and don't conduct electricity as well. Using a wire brush and some contact cleaner to refresh the stock ones or just replacing them will likely improve your problem.

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17 Oct 2005 07:47 #2324 by aproud1
Replied by aproud1 on topic Lights dragging down Idle.
I'm pretty sure old corroding wire connections are all I have. I guess I see a new winter project coming along. Thnks for the info...

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17 Oct 2005 08:02 #2326 by aproud1
Replied by aproud1 on topic Lights dragging down Idle.
That sounds like a great idea. Maybe once I get my carb a bit more straightened out I'll try that. I only have a kick start so my right shin would appreciate a better spark.

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21 Oct 2005 18:08 #3322 by luvmykaw
Replied by luvmykaw on topic Lights dragging down Idle.
I got a new battery and the difference was like night and day. I had to manualy switch my signals before the battery change, and my horn sounded like a hemmoroidal sheep fart. It all works fine now.

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