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Replacement Ignition? (1979 A1) 1 month 4 weeks ago #29619

  • SteveSmith
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Evening all,
I finally had a ride out on my kz1300.
The hydraulic clutch conversion I did has turned out fine (though I’d forgotten just how heavy/clunky changing gear is on old bikes).
Driving in slow traffic it feels like I’m getting stuttering sparks, once I get into flowing traffic it all runs nicely, when the revs drop it stutters.
I suspect ignition rather than fuel.
Given the chance of standard parts being available nowadays, what’s the collective wisdom about which parts to buy?
Dynatech coils? But which ones? 
Pickups and CDI replacement?

The dreaded interweb lists XDG 3.32 as a product, from Germany, any thoughts?

thanks all
Steve
1979 KZ1300-A1

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Replacement Ignition? (1979 A1) 1 month 3 weeks ago #29627

  • Kawboy
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I had to think about this one for a few minutes because ignitions usually work and then they don't. So what could cause the ignition to partially fail at low speed?
The only thing that comes to mind is the pulser coil circuit. One has to understand how the pulser coils work on the KZ. They are an induction coil influenced by a permanent magnet. At idle, they produce around 5 volts and I believe above 2000 or 3000 rpms, they produce around 8 volts. Their purpose is to trigger the Darlington transistors in the igniter. The Darlington transistors open and close the primary circuit in the coils Depending upon the voltage produced by the pulser coils, the Darlington transistors remain closed for longer periods of time (dwell) in ignition terms.

I suspect that you may have higher than acceptable resistance in the wiring between the pulser coils and the igniter causing the output voltage from the pulser coils to be low and not firing the Darlington transistors properly.
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Replacement Ignition? (1979 A1) 1 month 3 weeks ago #29631

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Thank you, the wires coming out of the cover at the right hand end of the crank (that’s where the coils live I guess?) will be my starting point.
cover me, I’m going in :-)
1979 KZ1300-A1

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Replacement Ignition? (1979 A1) 1 month 3 weeks ago #29632

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No, On the 79 A1 the ignition pick-up coils are under here, aren’t they?
 
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Replacement Ignition? (1979 A1) 1 month 3 weeks ago #29633

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On the'79, the pulser coils are under the small( 4") cover just under the carbs. 

I always like to refer to the wiring diagram for reference when trouble shooting electrical.
I think you should really start at the 6 pin connector up near the igniter.  Kawasaki refers to them as pick up coils.

 
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Replacement Ignition? (1979 A1) 1 month 3 weeks ago #29651

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No, On the 79 A1 the ignition pick-up coils are under here, aren’t they?

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Hi HairyLeg,
I've come to believe that using the back button while composing a post causes the software to get confused and results in that permissions message.
Sorry. Go ahead and try again. You have 24 hours to edit your post.
Bill
 

1947 Indian Chief, 1968 BSA Shooting Star, 1970 BSA 650 Lightning, 1974 Kawasaki W3, 1976 KZ900 A4, 1979 KZ750 B4, 1979 KZ750 B4 Trike, 1980 KZ550, 1981 KZ1300, 1982 KZ1100 Spectre, 1985 Kawasaki ZN1300, 1987 Yamaha Trail Way, 2000 Honda Valkyrie Tourer, 1981 GL 1100, 2009 Yamaha RoadLiner S

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