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Author Topic: KZ-440 stalling while slowing down  (Read 354 times)

Offline VonYinzer

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Re: KZ-440 stalling while slowing down
« Reply #10 on: Jul 19, 2017, 17:39:49 »
Sync the carbs and set timing. Adjust the clutch as well. Make sure everything is at factory settings.
Like a river that don't know where it's flowin'
I took a wrong turn and just kept goin'

Offline advCo

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Re: KZ-440 stalling while slowing down
« Reply #11 on: Jul 19, 2017, 18:35:16 »
Leaking needle and seat and/or leaky float can cause this, as well. Old carb on the CT90 has a hole in the float and you have to blip the throttle to keep it running when coming to a stop.
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline greenearwax

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Re: KZ-440 stalling while slowing down
« Reply #12 on: Aug 07, 2017, 11:07:56 »
So here's an update on the issue.
I managed to figure out that im losing spark as the engine heats up.
After asking around most people said that that was probably caused by an ignition coil breakdown. after replacing it i'm still having the same issue of no spark once it warms up.
I don't have a totally accurate wiring diagram because apparently my model bike was only made in small quantities? (kz440 g1). and there are differences from the other kz440s such as my bike has a pickup coil rather than points. im not sure what else though. All the comments and help is appreciated! thanks guys!

edit: Im thinking it might be the transistor igniter? not really sure though
« Last Edit: Aug 07, 2017, 11:10:04 by greenearwax »

Offline vwrabbit

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Re: KZ-440 stalling while slowing down
« Reply #13 on: Aug 07, 2017, 11:38:19 »
Should be able to find another igniter on fleabay for about $35-50 (if no one has one here), cheaper if you are patient.  I've heard that a 750 twin will work.  Only use one side obviously. 

Offline advCo

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Re: KZ-440 stalling while slowing down
« Reply #14 on: Aug 07, 2017, 12:08:04 »
Your original issue was "stalling while slowing down" or coming to a stop, nothing to do with when the bike warms up. If the coils didn't fix it its unlikely that its an ignition problem.

Here's a free test you can do. Go for a ride and try to reproduce the problem. Right before the issue usually happens, turn the petcock to OFF position, and see if it goes back to normal.

I would check your float height and float valve to make sure they are set and working properly before you keep throwing parts at it.
« Last Edit: Aug 07, 2017, 12:10:07 by advCo »
"He broke the mirrors off his Cadillac, 'cause he doesn't like it looking like he looks back."

74 CB360 - Luna - http://www.dotheton.com/forum/index.php?topic=63294.0
82 GS550L - Tracker-ish - http://www.dotheton.com/forum/index.php?topic=67229.0 - Sold
74 XL350 - The Turd - http://www.dotheton.com/forum/index.php?topic=70252.0
Suzuki FA50 "No-Ped" - http://www.dotheton.com/forum/index.php?topic=71189.0
73 Suzuki RV125 -http://www.dotheton.com/forum/index.php?topic=73875.0

Offline greenearwax

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Re: KZ-440 stalling while slowing down
« Reply #15 on: Aug 07, 2017, 12:48:30 »
Your original issue was "stalling while slowing down" or coming to a stop, nothing to do with when the bike warms up. If the coils didn't fix it its unlikely that its an ignition problem.

Here's a free test you can do. Go for a ride and try to reproduce the problem. Right before the issue usually happens, turn the petcock to OFF position, and see if it goes back to normal.

I would check your float height and float valve to make sure they are set and working properly before you keep throwing parts at it.

Ill definitely check the floats next. but I should have mentioned that the issue has gotten worse where at one point it happened while I was cruising at like 5000rpm. Last night it quit when I just let it run in the driveway for 10 minutes so I definitely think its temperature related (that's when I checked spark and there was none). Maybe it was just a coincidence that the first few times it happened it was while I was slowing to a stop. not really sure.