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Author Topic: Couple of questions about coils  (Read 2487 times)

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Mattydiah

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Couple of questions about coils
« on: May 09, 2008, 03:34:07 PM »
Well, I thoroughly destroyed my 750K's coils trying to cut them open to get the plug wire out of them :o

Oh well, live and learn.

Anyways, I'm heading to the boneyard tomorrow, to pick up a set of coils.  I know that CB900 coils will work, as will first generation Goldwing coils.  I'm wondering what else will work on my 750?  Will 550 or 650 coils work?  How bout any other Honda coils?

Thanks.
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Offline greenjeans

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Re: Couple of questions about coils
« Reply #1 on: May 09, 2008, 04:26:21 PM »
76-78 goldwing coils work easily.
pretty much all the 750 ones will work as well.

I have some goldwing coils on mine - they work great
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Offline jaguar

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Re: Couple of questions about coils
« Reply #2 on: May 10, 2008, 03:41:40 AM »
what do all the dyan ohm coils mean?  what coil is right for what apl?
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Offline greenjeans

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Re: Couple of questions about coils
« Reply #3 on: May 10, 2008, 08:57:05 AM »
Mine are molded in like the 750's  I've seen some of the goldwing ones that have replaceable plug wires.
Not sure of the exact years though.  That's what I wanted to do with mine originally.
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Offline feliz

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Re: Couple of questions about coils
« Reply #4 on: May 10, 2008, 12:18:54 PM »
I'm assuming the F coils are the same as the K, can anyone confirm this? I'm thinking of taking the coils from my 76F and using them on my 75 or 73 K.
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Online bryanj

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Re: Couple of questions about coils
« Reply #5 on: May 10, 2008, 12:51:39 PM »
How come wing coils fit when they have a ballast resistor on the wing?
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Offline HondaMan

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Re: Couple of questions about coils
« Reply #6 on: May 10, 2008, 03:52:04 PM »
Quote from: jaguar on May 10, 2008, 03:41:40 AM
what do all the dyan ohm coils mean?  what coil is right for what apl?

The stock SOHC4 coils from Honda are about 4.4 ohms primary. For best results with Dyna coils, use the same or HIGHER ohms resistance. If you go to lower ohms, you should add external resistance to make up the difference, or there will be troubles. Not always will the troubles surface immediately: some troubles will be more like a slow infection...  ::)
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See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
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Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
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Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline HondaMan

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Re: Couple of questions about coils
« Reply #7 on: May 10, 2008, 03:53:28 PM »
Quote from: feliz on May 10, 2008, 12:18:54 PM
I'm assuming the F coils are the same as the K, can anyone confirm this? I'm thinking of taking the coils from my 76F and using them on my 75 or 73 K.

They interchange just fine, but the K0-K5 plug caps had resistors in them: after that, they were non-resistor caps, which then require that you use resistor sparkplugs instead.
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See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline HondaMan

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Re: Couple of questions about coils
« Reply #8 on: May 10, 2008, 03:55:04 PM »
Quote from: bryanj on May 10, 2008, 12:51:39 PM
How come wing coils fit when they have a ballast resistor on the wing?

They fit, but introduce the same electrical problems as the 3-ohm Dyna coils: they need external resistors.
(I've been helping a couple other 500/550 riders fix theirs up, lately...  :(  ).
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See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline HondaMan

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Re: Couple of questions about coils
« Reply #9 on: May 10, 2008, 11:34:59 PM »
Quote from: Mattydiah on May 10, 2008, 11:09:27 PM
Hell, partsnmore.com has CB900 coils for $30 a crack, I might just pick those up.

Are there any issues or things I need to know about running CB900 coils?

I'd say to just check the ohms of the primary side, first. Make sure it's 4 ohms or more, or adjust accordingly.
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See SOHC4shop.com for info about the gadgets I make for these bikes.

The demons are repulsed when a man does good. Use that.
Blood is thicker than water, but motor oil is thicker yet...so, don't mess with my SOHC4, or I might have to hurt you.
Hondaman's creed: "Bikers are family. Treat them accordingly."

Link to Hondaman Ignition: http://forums.sohc4.net/index.php?topic=67543.0

Link to My CB750 Book: https://www.lulu.com/search?adult_audience_rating=00&page=1&pageSize=10&q=my+cb750+book
Link to My CB500/CB550 Book: https://www.lulu.com/search?sortBy=RELEVANCE&page=1&q=my+cb550+book&pageSize=10&adult_audience_rating=00
Link to website: https://sohc4shop.com/  (Note: no longer at www.SOHC4shop.com, moved off WWW. in 2024).

Offline jaguar

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Re: Couple of questions about coils
« Reply #10 on: May 11, 2008, 11:45:55 AM »
hondaman m not sure i understand you right.
im alittle slow with electrical stuff
i have a cb750 that i want to use a dyna 2000, bought 2.2 grey coils.  what do i need to do to make it work well?  why the difference in ohms then?  will a 2.2 3.0 or something higher do something different for a motor?  whats the reason for the choice?
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