Author Topic: GL 1000 coils on CB 750 - anybody tried it ?  (Read 7817 times)

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Offline greenjeans

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GL 1000 coils on CB 750 - anybody tried it ?
« on: March 05, 2008, 05:28:33 AM »
Sorry, this is a bit wordy,
Well, last night I tried to solve the coil problem on my '72 CB750k - plug wires are old, cracking and starting arc where there not supposed to.  Not getting a good spark. Cranking it in a dark shop was enlightening....  So, I cut off some of the wire in attempt to put the boots back on and the wire was gooey.  Not a good sign.  Keep going up the wire about 4 inches before it seemed good.  Now they are too short so I call all over town and finally find some old style copper core plug wires.  At this point I figured I try to replace the "unreplaceable" wires from the coils - they are molded in.   I cut them down to about 1" out from the coils, then stripped a half inch of the insulation off the remaining wire stubs.  Then I just started wiggling the stub of wire coming out the coils...eventually, the insulation came out and I was left with a decent looking strand of wires coming out of the coils.   
   This is where I stopped.   I couldn't really think of an ingenious way to attach the new plug wires besides soldering them....and then taking a scrap piece of the plug insulating wire and slitting it lengthwise and then putting it over the soldered joint.  Then I figured I'd put a few layers of heat-shrink insulation over that...  Think that will work ?     I heard of epoxy as a way to attach them as well.

As a back up plan, I ordered some decent looking GL1000 coils and wires off ebay last night.  I've read that they have the potential to throw a bigger fatter spark anyway...kind of a old-school cheap upgrade.   

Anybody used GL1000 coils ?
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline andy750

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #1 on: March 05, 2008, 05:42:24 AM »
Yes they should work. These ones have the removable wires:

http://cgi.ebay.com/ebaymotors/1980-Honda-GL1100-GL-1100-Goldwing-Coils-GL1000-GL1200_W0QQitemZ170198661399QQcmdZViewItem?hash=item170198661399

They also have the yellow (and blue?) and black/white wire coming out the back to hook up to your harness.

These will also work with some mods....

http://cgi.ebay.com/ebaymotors/Ignition-coils-cb750-cb650-cb900-cb1000-cb1100-gl1000_W0QQitemZ230228017630QQcmdZViewItem?hash=item230228017630


CB900 and CB750 (1979-) will also work.

cheers
Andy
Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline SteveD CB500F

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #2 on: March 05, 2008, 05:56:35 AM »
You could try this from the FAQs
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Offline greenjeans

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #3 on: March 05, 2008, 07:19:05 AM »
Steve - what link is that supposed to pull up ?   I keep keeping a pic of a sweet hardtail.
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline SteveD CB500F

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #4 on: March 05, 2008, 07:24:33 AM »
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Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #5 on: March 05, 2008, 08:32:59 AM »
Hey Greenjeans...
I wrote up a procedure for changing out the wires on the stock coil.
That was a few years ago, but I think it's still in the FAQ section.
Mine are still working great...so it seems to be a good fix.
It's not really very hard to do and doesn't take too much time.

Offline SteveD CB500F

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #6 on: March 05, 2008, 08:38:30 AM »
I was looking for the write-up but couldn't find it. There was one with pictures wasn't there?

If we can dig it out I'll put it in the FAQs.
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Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #7 on: March 05, 2008, 08:44:21 AM »
Hey Steve...
I "THINK" I may still have the picts and text on my computer at home.
If you can't find it here...let me know and I can send them tonight.

Offline SteveD CB500F

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #8 on: March 05, 2008, 08:49:28 AM »
Take a look will you.

Your original thread seems to have gone walkies...

http://forums.sohc4.net/index.php?topic=17022.msg175605#msg175605

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Offline greenjeans

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #9 on: March 05, 2008, 08:50:43 AM »
Well, I tried splicing new wires on last night.  Thought I'd let the epoxy dry overnight.
I ordered the GL1000 coils as a back-up plan....seemed cheap and easy enough.
I'll see how they fire this evening.

Great stuff on the ignition/points etc.  Thanks for that.  I'm going to dial in my new points and condensers this evening as well.

Hopefully now I'll get that fat blue spark I've always dreamed of. ;)
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #10 on: March 05, 2008, 08:53:32 AM »
OK Steve...
I'll look when I get home tonight...I'm pretty sure at least the picts are still there.

Offline mystic_1

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #11 on: March 05, 2008, 09:53:23 AM »
Try this, guys:

http://www.xs11.com/tips/repair/repair24.shtml


This article describes cutting into the coil's body in order to extract the old plug wire, then installing new plug wiring into the body of the coil itself.  No wire splicing involved.

Article is specific to Yamaha XS1100s but to my eye it looks like this should work on Honda CB coils, too.

Disclaimer:  I've never tried this.  I just sucked it up and bought new OEM coils lol

mystic_1
"A ship in harbor is safe, but that is not what ships are built for."
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline greenjeans

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #12 on: March 05, 2008, 10:54:40 AM »
Yep, I bet it would work....almost makes me want to cut into mind and find out what's in there.  Not completely satisfied with my fix.  I wasn't sure if you could get rid of that plastic molding around the coils without destroying them.  Would anyone be afraid of it arcing ?   Anybody know if epoxy or silicone sealant is a good insulator...I'm guessing that the silicon would be, but what about epoxy ?
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline SteveD CB500F

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #13 on: March 05, 2008, 10:58:44 AM »
The thread that I'm trying to find involved using a dremel to cut open the coils, solder on new leads and epoxy back up.

Is that what you had in mind?
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Offline mystic_1

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #14 on: March 05, 2008, 11:13:56 AM »
I bet I still have my old crap coils lying around somewhere.  If I can turn them up I'll slice them open to see what's there.


mystic_1
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #15 on: March 05, 2008, 11:45:40 AM »
Yep...that's basically what I did with mine...Use a dremel tool to cut the coils open...replace the wire and then re-fill the area with epoxy. I've put about 7,000 miles on mine since and have been in the rain and the car wash...so far...so good.
Tonight I'll see if I still have the article and pictures.
Almost positive I have the picts at least.
I'll try posting them here...or send them to Steve for the FAQ section.

Offline SteveD CB500F

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #16 on: March 05, 2008, 12:01:51 PM »
and have been in the rain and the car wash...

Tell us about this.

Did you wear decent waterproofs?
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Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #17 on: March 05, 2008, 12:11:24 PM »
Yeah...but damn that hot wax is TOUGH!

Offline greenjeans

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #18 on: March 05, 2008, 12:24:22 PM »
Well.....
I'll cut mine open this evening.  I'll take pics and report back with results.
Can't be any worse than it was, & I have a back-up plan on the way.
Yep, I'm the kid that figured out how to put things back together...eventually.

Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #19 on: March 05, 2008, 12:32:03 PM »
Greenjeans...you just need to cut the area where the wires go in...if you will send me an E-mail address...I'll forward you the picts and the text if I still have it.
Use an NON filled epoxy...Clear type...not JB weld...it has ground aluminum in it I think...might cause a problem. The picts will make it very clear how to do the job...
I think to do both coils took just a bit over an Hour.

Offline hcritz

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #20 on: March 05, 2008, 12:36:21 PM »
Hey GreenJeans...
I found the original article here...not sure the picts work...but you can try...
I think the actually artical is on the second page of the thread.
http://forums.sohc4.net/index.php?topic=10429.0

Offline mystic_1

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #21 on: March 05, 2008, 01:16:58 PM »
Hey GreenJeans...
I found the original article here...not sure the picts work...but you can try...
I think the actually artical is on the second page of the thread.
http://forums.sohc4.net/index.php?topic=10429.0


Looks good - here's the relevant pic from the article hcritz references:



basically the same technique as the article I linked, which shows a few variations on where cuts can be made. 






HTH

mystic_1
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My build thread:  http://forums.sohc4.net/index.php?topic=68952.0

Offline kghost

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #22 on: March 05, 2008, 01:30:13 PM »
Far as I can tell my GL1000 coils are exactly the same as most 750 coils...cept the wires are longer.....

Is there a winding difference?
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Offline andy750

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #23 on: March 05, 2008, 01:48:39 PM »
Mystic,

""Do nothing which is of no use."
- Musashi Moyomoto"

Do you mean Musashi Miyamoto here, probably the greatest samurai ever to have lived...or do you mean someone else?  ;) ::)

cheers
Andy

Current bikes
1. CB750K4: Long distance bike, 17 countries and counting...2001 - Trans-USA-Mexico, 2003 - European Tour, 2004 - SOHC Easy Rider Trip , 2008 - Adirondack Tour 2-up , 2013 - Tail of the Dragon Tour , 2017: 836 kit install and bottom end rebuild. And rebirth: http://forums.sohc4.net/index.php/topic,173213.msg2029836.html#msg2029836
2. CB750/810cc K2  - road racer with JMR worked head 71 hp
3. Yamaha Tenere T700 2022

Where did you go on your bike today? - http://forums.sohc4.net/index.php?topic=45183.2350

Offline mystic_1

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Re: GL 1000 coils on CB 750 - anybody tried it ?
« Reply #24 on: March 05, 2008, 02:02:10 PM »
Mystic,

""Do nothing which is of no use."
- Musashi Moyomoto"

Do you mean Musashi Miyamoto here, probably the greatest samurai ever to have lived...or do you mean someone else?  ;) ::)

cheers
Andy




Heh, what I meant there is "don't work on your forum profile late at night".

thanks!

-m
"A ship in harbor is safe, but that is not what ships are built for."
- John Augustus Shedd

My build thread:  http://forums.sohc4.net/index.php?topic=68952.0