left coil wont fire!!

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29 Apr 2012 22:53 #518707 by Rev
left coil wont fire!! was created by Rev
Just cleaned and set up carbs, replaced damaged coil and new plugs. started right up but only on 1&4. Check to see that the dyna s was working properly, didn't have a ohms meter to check coil so I replaced it with a known working dyna coil, but still would not fire. Is there something else I should look at? :sick: :angry:
78 kz650, Maxi-dwell, Modified flow through air box, Dyna coils.

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29 Apr 2012 23:06 #518711 by MFolks
Replied by MFolks on topic left coil wont fire!!
I'd check with Dyna, and see if the warranty covers your unit. To me, It sounds like a pick up coil has failed, either due to heat, or vibration.

Checked the resistor inside the sparkplug cap? It should test to 5000 ohms.
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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29 Apr 2012 23:09 #518713 by moneypit
Replied by moneypit on topic left coil wont fire!!
Check tp make sure that the plugs are good I had the same trouble 2 weeks ago. It was 2 bad plugs in 2+3
2-76 kz900
St Paul MN

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29 Apr 2012 23:17 - 29 Apr 2012 23:19 #518717 by Patton
Replied by Patton on topic left coil wont fire!!
Would assure that voltage being received at the coil primary terminal matches the battery voltage as measured across the battery posts.

Might be a defect in the spark plug cap, or defect in a connection between cap and plug wire.



Good Fortune! :)
1973 Z1
KZ900 LTD
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Last edit: 29 Apr 2012 23:19 by Patton.

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29 Apr 2012 23:18 #518718 by MFolks
Replied by MFolks on topic left coil wont fire!!
Using NGK plugs? I've had some fail either right out of the box, or sometime later, making troubleshooting a real head scratcher. I've changed to Denso W24-ESU in my bike.

Sparkplug Cross Index
www.gadgetjq.com/spark_plug_cross_reference_motorcycle.htm
www.sparkplug-crossreference.com/convert/NGK_PN/B8ES/
1982 GPZ1100 B2
General Dynamics/Convair 1983-1993
GLCM BGM-109 Tomahawk, AGM-129A Advanced Cruise Missile (ACM)

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29 Apr 2012 23:19 #518719 by Rev
Replied by Rev on topic left coil wont fire!!
I have replaced the first coil which was new, with another coil that I knew was good. I think I will switch the 1&4 plugs around with the 2&3 plugs and see if it makes a difference.
Thanks
78 kz650, Maxi-dwell, Modified flow through air box, Dyna coils.

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29 Apr 2012 23:26 #518720 by Patton
Replied by Patton on topic left coil wont fire!!
Dyna-S coil has screws that attach wires to the primary terminals.

The stock mounting spacers are typically used when installing the coils.

The head of the screws sometimes comes dangerously close to the coil mounting spacers, and may short against the spacer.

Would assure that there's sufficient clearance between the heads of the screws and the mounting spacers.
Or insulate them from each other.

Good Fortune! :)
1973 Z1
KZ900 LTD

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29 Apr 2012 23:40 #518725 by Rev
Replied by Rev on topic left coil wont fire!!
Just switched 2&3 plugs with 1&4 and 1 & 4 fired up but not 2&3 so the plugs are not the issue. I guess I will have to wait until I bring my muti meter home. :angry:
78 kz650, Maxi-dwell, Modified flow through air box, Dyna coils.

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29 Apr 2012 23:44 #518727 by Rev
Replied by Rev on topic left coil wont fire!!
Thanks Patton, I have bypassed this problem by using zapstraps on the terminal side, and the standard attachment bolt on the other side.
78 kz650, Maxi-dwell, Modified flow through air box, Dyna coils.

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29 Apr 2012 23:49 #518730 by Rev
Replied by Rev on topic left coil wont fire!!
Thanks my ohm meter is at work so I will have to wait till tomorrow to check the voltage.
78 kz650, Maxi-dwell, Modified flow through air box, Dyna coils.

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30 Apr 2012 00:37 - 30 Apr 2012 00:39 #518740 by Patton
Replied by Patton on topic left coil wont fire!!

Rev wrote: Thanks my ohm meter is at work so I will have to wait till tomorrow to check the voltage.


Would also ohm-check coil's (1) primary winding, and (2) secondary winding, measuring resistance between clips inside the plug caps.

If there's a break in conductivity somewhere within the secondary loop, it typically results in loss of spark at both plugs.

Sometimes it helps to remove the cap and snip the plug wire ΒΌ" to gain a better connection with the cap.

And sometimes a cap is found defective.

Good Fortune! :)
1973 Z1
KZ900 LTD
Last edit: 30 Apr 2012 00:39 by Patton.

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30 Apr 2012 09:09 - 30 Apr 2012 09:10 #518780 by Old Man Rock
Replied by Old Man Rock on topic left coil wont fire!!
Did you perform the Dyna Static Alignment/Tests (12Vdc lamp tester)...?
Dyna rotor Magnet on the correct orientation (TDC 1/4, should be pointed left)...?

Here's some issues/things I encountered, possibly help you out...
DYNS S Installation



NOTE: Solder the +12Vdc versus crimp as in the bottom right image...

1976 KZ900-A4
MTC 1075cc.
Camshafts: Kawi GPZ-1100 .375 lift
Head: P&P via Larry Cavanaugh
ZX636 suspension
MIKUNI, RS-34'S...
Kerker 4-1, 1.5" comp baffle.
Dyna-S E.I.
Earls 10 row Oil Cooler
Acewell 2802 Series Speedo/Tach
Innovate LC1 Wideband 02 AFR meter

Phoenix, Az
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Last edit: 30 Apr 2012 09:10 by Old Man Rock.

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