2/3 Coil only fires half the time!!! RESOLVED :)

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 20:58
#478788
So I jumped both coil 12v feeds as well as the one for the Dyna-S (just to be certain), and I still have the same result! Coil 2/3 fires 1/2 the time, as shown by an idle rpm of 500-700 on my tach (it works correctly on the 1/4 coil). So tomorrow, I will ohm check the coil, and the wires, and if anyone has a check for the dyna-s I will run that too (may have gotten a bad one). Anything else I should check?
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:03 - 22 Sep 2011 21:09
#478790
This is on the Dyna site, and has the trouble shooting.
classicwingclub.org/frankspage/pdf/DynaS.PDF

have you used your timing light, shining it so you can see the light flash. then move to each cylinder. If 1 is really dropping it will effect two as the coil twin fires through both. One from the center electrode to the side electrode, then the other reverse. Making a Loop. Bad plug wire or plug can cause this.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...
Last edit: 22 Sep 2011 21:09 by Motor Head.
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  • MFolks
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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:13
#478796
Tried a different brand of sparkplug? I've had more than a few NGK's fail right out of the box, so I'm usung either Accel #116 or Denso W24-ESU's gapped to 0.032".
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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:13
#478797
Motor Head wrote: This is on the Dyna site, and has the trouble shooting.
classicwingclub.org/frankspage/pdf/DynaS.PDF

have you used your timing light, shining it so you can see the light flash. then move to each cylinder. If 1 is really dropping it will effect two as the coil twin fires through both. One from the center electrode to the side electrode, then the other reverse. Making a Loop. Bad plug wire or plug can cause this.

Thank you for the link, it will come in handy. This may be a dumb question, but since the swap had the issue stay on the 2/3 coil, is it possible that the issue may be one of those 2 spark plugs? I would think not, but I guess it is possible for them to short out somehow. They are all brand new plugs, but sometimes I'm sure there are bad ones in the bunch.
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

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KZ1000 P (For a "touring" bike)
Z1 (need I...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:15
#478798
MFolks wrote: Tried a different brand of sparkplug? I've had more than a few NGK's fail right out of the box, so I'm usung either Accel #116 or Denso W24-ESU's gapped to 0.032".

WOW! I was just posting a question asking about that while you posted the answer. Strange! I am almost certain I am using NGK, so is there a way to check the plugs, or is it just to yank them out and crank the engine looking for spark?
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:15
#478799
Did you swap the pugs over to the working coil, to eliminate that?
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:18
#478800
Motor Head wrote: Did you swap the pugs over to the working coil, to eliminate that?

No! That will be the first thing I try tomorrow! I didn't think that would make the coil fire intermittently as long as they were in the engine, they're grounded so I figured that couldn't be the issue!
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:19
#478801
Measure the Ohm's in those wires also, to be sure there is no problem with a Spark plug wire.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 21:41
#478804
Motor Head wrote: Measure the Ohm's in those wires also, to be sure there is no problem with a Spark plug wire.

It's on the list :)
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

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Z1 (need I...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 23:00
#478827
Primary resistance on the coil is ok, but I'm not sure what the secondary should be on the Dyna 3 ohm coils. I also checked the 2 wires off the problem coil, but I couldn't get a steady reading on either, though neither read 0.
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

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KZ1000 P (For a "touring" bike)
Z1 (need I...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 23:05
#478831
You also said you were not getting a steady reading when checking voltage, is the Meter suspect? Try the measurement for Ohm's with the meter set to the 10K Ohm Scale. There should be a "Range" button. What meter do you have? I could Google it so I can help better.
You may have to Move the red lead to the Ohm hole on the meter. Also making sure the black is in the correct hole.
1982 KZ1000LTD K2 Vance & Hines 4-1 ACCEL COILS Added Vetter fairing & Bags. FOX Racing rear Shocks, Braced Swing-arm, Fork Brace, Progressive Fork Springs RT Gold Emulators, APE Valve Springs, 1166 Big Bore kit, RS34's, GPZ cams.
1980 KZ550LTD C1 Stock SOLD Miss it
1979 MAZDA RX7 in the works, 13B...

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Re: 2/3 Coil only fires half the time!!!

22 Sep 2011 23:11 - 22 Sep 2011 23:11
#478833
The meter seems to be working fine. Steady readings for voltage on the battery, and a nice steady 3.3 ohm reading for the primary on the coil. I'm not sure I had the probes held steady against the terminals for the plug wires. This is similar to the meter I have, if not the exact model:

[link] www.craftsman.com/shc/s/p_10155_12602_03...d=multimeter&prdNo=7 [/link]
Southern Maryland, USA

1980 KZ250 LTD (traded, but still missed)
1982 KZ750 E3 (Cafe Project) (Dyna-S, Dyna Coils, V&H 4-1, K&N Pods, 6 Sigma Jet Kit, Acewell Computer, Woodcraft Clip-ons, Custom Rewire)
1966 A1 Samurai (Restoration Project)

Wish List:
KZ1000 P (For a "touring" bike)
Z1 (need I...
Last edit: 22 Sep 2011 23:11 by clutch.

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