Dyna coil failure...overcharging system?

Old Man Rock
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Re: Dyna coil failure...overcharging system?

07 Oct 2010 04:04

DOH... Good catch, thanks Loud.....

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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madmatt1
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Re: Dyna coil failure...overcharging system?

07 Oct 2010 16:52

#405037

I didn't switch the wires between the two coils, but I did use a test light and both are getting power...

1977 KZ1000 LTD
1979 KZ1000 LTD
1978 KZ1000A

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steell
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Re: Dyna coil failure...overcharging system?

08 Oct 2010 13:29

#405236

madmatt1 wrote:

I didn't switch the wires between the two coils, but I did use a test light and both are getting power...

That doesn't tell you anything, the Dyna S "grounds" the coil.
You really need to swap the wires from the Dyna S around and see if the lack of spark moves to the other coil.

Only takes a couple of minutes to check, and it beats spending $140 for a new set of coils only to find out that's not the problem.

Might be a bad coil, I'm saying it's worthwhile to check though.

KD9JUR

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TeK9iNe
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Re: Dyna coil failure...overcharging system?

08 Oct 2010 14:57

#405251

loudhvx wrote:

TeK9iNe wrote:

otakar wrote:

I don't think that higher voltage would hurt the coils. My new MSD ignition pumps 400 Volts into the coils.

What the... ??? Why?

400 Volts... what kind of amperage?

:huh:

It's CDI. CDI systems hit the coils with a big spike of voltage. The coil just acts like a transformer unlike in a standard KZ ignition where it actually stores energy.

However, the coils in the standard KZ ignition also get a spike of several hundred volts on them right when the points open, or right when the igniter lifts the ground side of the coil.

In CDI, the module generates the high voltage, in standard (Kettering) ignition, the coil generates the high voltage. Both of these are on the primary side of the coil. The coil steps up this several hundred volt spike into several thousands of volts at the plugs.

After the spark initiates, the voltage (on primary and high-tension side) drops to a much lower level.

Ah shit, I knew that...

stupid stupid. :laugh:

Motorcycle Shop Owner/Operator

79 Kawie Z1000 LTD
81 Kawie Z1000 CSR
83 Honda VT750C A
85 Kawie GPZ900 A2
86 Zukie GS1150 EG
93 Yamie XV1100 E
Lucky to have rolled many old bikes through my doors

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