Coil question

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03 Mar 2007 14:23 #117036 by wrecktec
Coil question was created by wrecktec
Has anyone here ever tried using automotive coils on their bikes? I found some auto coils that have the exact primary resistance as the one on my KZ305 but the primary resistance is a little low. Just wondering what harm could be done by trying this.

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03 Mar 2007 14:29 #117037 by loudhvx
Replied by loudhvx on topic Coil question
I'm not familiar with the 305, but don't use a coil with lower primary resistance, only higher. Many automotive ignitions use current limiters to protect the coils. KZ's do not. If the coil primary is too low, you can burn the coil or the ignition or both.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

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03 Mar 2007 14:58 #117042 by kzwolfsr
Replied by kzwolfsr on topic Coil question
Nothingelse needs to be said on that, Loud said it all
1979 KZ SR650, stock candy persimmon red and crossover pipes
1981 KZ 1000LTD with non stock and more comfortable handle bars and 4 into one V&H
Original man of the Caribbean

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03 Mar 2007 15:14 #117048 by wrecktec
Replied by wrecktec on topic Coil question
I'm sorry, I worded that worng. The primary resistance is right on the money. The secondary resistance is what is a little low.

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03 Mar 2007 15:44 #117054 by loudhvx
Replied by loudhvx on topic Coil question
If the primary is the same, then there's a chance it will work. The next consideration is if it was meant to be used with a current limiter.

Most car coils have a much lower primary resistance than KZ coils. KZ's are in the 2.5 ohm range, car coils go down to the 0.5 ohm range.
What car is the coil from?
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

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03 Mar 2007 16:06 #117058 by wrecktec
Replied by wrecktec on topic Coil question
Primary resistance on my orignal KZ coils and the auto coils measures 3.8 ohms. Secondary measures 11 ohms on the orignal KZ coils and 6 someting ohms on the auto coils. The auto coils I have say on them "no external resistor requrired" which i guess means u do not have to run a ballast resistor or resistor wire in the primary circuit.

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  • pstrbrc
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  • '81 GPz 1100 project
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03 Mar 2007 16:09 #117060 by pstrbrc
Replied by pstrbrc on topic Coil question
OK, you've piqued my curiosity. What auto coils are you looking at?
\'81 GPz 1100 project
Elkhart, Kansas USA
\"Man does not control his own fate. The women in his life do that for him.\" Groucho Marx

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03 Mar 2007 16:45 #117074 by loudhvx
Replied by loudhvx on topic Coil question
If it's 3.8 ohms, the coil is for points.
Does the KZ305 use points? Even in 1982?
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

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03 Mar 2007 16:52 #117076 by loudhvx
Replied by loudhvx on topic Coil question
loudhvx wrote:

If it's 3.8 ohms, the coil is for points.
Does the KZ305 use points? Even in 1982?

Well, I looked it up on buykawasaki.com.

The KZ305 CSR is a 180 degree motor. This means it uses two single-output coils, like an old car coil. It is also points-operated, even in 1982.

So if the car coil is really 3.8 ohms, at least the points shouldn't get hurt, so it's worth a try.
1981 KZ550 D1 gpz.
Kz550 valve train warning.
Other links.

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03 Mar 2007 17:04 #117080 by OKC_Kent
Replied by OKC_Kent on topic Coil question
Or buy this ebay coil that ends in 3 minutes.

tinyurl.com/2gsv8j

Post edited by: OKC_Kent, at: 2007/03/03 20:06
Oklahoma City, OK
78 KZ650 B2 82,000+ miles

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03 Mar 2007 17:06 #117081 by wrecktec
Replied by wrecktec on topic Coil question
I figured it is worth a try, considering you can buy these coils for about $20 each. I went to a good local auto parts store and bought solid core non-supression spark plug wire,termanal ends, and misc to build new wires for under $4. Bought new NGK resistor boots for about $4 dollars each. This seems like it is much cheaper than any other alternitaves i can come up with.

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03 Mar 2007 17:09 #117083 by wrecktec
Replied by wrecktec on topic Coil question
BTW OKC Kent, that is one of my old coils for sale. The other one had a broken wire which i could'nt do anything with.

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