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Discussion Starter #1
Went to start my 86' GL1200I Naked, No Start.

Pulled plugs checked for spark at all 4 plugs Nothing.

Checked my coils voltage 12V in, nothing out, on one coil.


Checked other coil, 12v in, 12v Out on the other coil.

Checked main fuse, I had converted main 30 amp dogbone fuse to a ATO blade fuse about 3 years ago.

It was burnt, Hum, replaced it, still, same at coils.


I had bought for $25.00 shipping included (EBAY), a set of 3ea coils including the spark plug wires from a 98' GL1500 6cyl.

The coils that I used were MP08, GL1500 coil and Spark Plug wires.


Hardest part was finding where I put them in my shop, but once located, I proceeded.


I thought I would swap in the MP08 coils from the GL1500 and test to see if the engine would start.


I new these MP08 GL1500 coils worked with the 4cyl. engines, cause I had put them on my 83' GL1100 a year earlier.


So I just un-wired the old coils, (while they were still in place) and then wired the new (Old) MP08 coils while hanging over the frame for test purposes only.

When hanging over the frame only 3 Spark Plug wires would reach the spark Plugs, that was good enough to verify spark, with all plugs in.


I started it, on 3 cylinders and it started much faster, and ran smooth.


It started faster than it had ever started before.


So that proved that I had a Internally shorted coil. Especially after further testing.


So removed the old coils, and Old Spark Plug wires.


Then I removed the Old Coil Mounts, I used My 86' coil mounts, with the new MP08 Coils, that way everything would mount correctly with No modifications to mounting.

When disassembling the MP08 GL1500 Coils,


I made sure to select the MP08 coils with the Spark Plug wires numbered 1,2,3,4, that way they are numbered for the corresponding cylinders on the 4cyl. Oldwing.


All I had to do is add one extra flat washer Under the mount where the wiring plugs into the coils, to provide more clearance for the wiring in this area.

Meaning, it already had One washer under this mount, I added One more for two washers under each mounting screw, on the wiring side only, to provide a little more spacing.

So two extra washers total.


Put it all back together, started it up this time on all 4 Cylinders, it started up faster than it had in the past, and was Very Smooth, even when cold.


To me the MP08 GL1500 Coil and Spark Plug Wires are a Upgrade.

and all for $25 to my door a inexpensive one.


There are Many More GL1500's out there than 4Cyl. goldwings,

Take advantage of the Volume of parts.


A couple of things I will mention, though that are different.

1. MP08 GL1500 Coils are a little Smaller than the 4cyl coils, but after mounted using the 4cyl. mounts they mount the same.

2. The GL1500 Spark Plug Wire are Different from the 4cyl. Plug wires.
the screw caps to the coils for the plug wires are smaller, you may be able to mix and match here but I wanted better and matching wires to the coils.


I test rode bike for over 200 miles, and it runs Much Smoother than it ever had before.


One other thing.

When you buy the MP08 GL1500 Coils, I got Three Coils, and Six plug wires they were mounted to the GL1500 coils Mounts (i did NOT use the GL1500 coils Mounts) I only used 2 of the coils and 4 of the Plug Wires.

This gave me One spare coil and Two spare Plug Wires for the shelf.


All for $25.00 to my door.
 

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Great job.
Might be a good sticky.
 

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Thanks for posting that up.

Will make sure the Forum Index has this for posterity.

Appreciate the results and sure others will too.
 

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Discussion Starter #4
I will see if i can get a good picture of two
 

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Discussion Starter #5
Here are a couple of pictures.

Pic #1, oh wait that was what I did during the winter.

in the rest of the pics you can see the new coils hiding in the frame using the stock 86' GL12 or what ever 4 cylinder oldwing coil Mounts.

pic shows Old 86' 4cyl coil vs Newer MP08 coil you can see the #MP08 on the Coil.

there is a size difference.

Pic you can see the GL1500 Spark Plug wires on my 86' GL12.

Note: My GL12 has been coinverted to NAKED.

To clean up old spark plug Wires,

I used Old Brake fluid, when I evac the old brake fluid out, i store it in a gallon container, and use it for cleaning and renewing old Rubber parts.

It does a good job, leave it on for a hour or two, and should be good.

In the picture that is just wipe it on let sit one minute then wipe off, I did not have the time to wait

With the smaller coils you can definitely get your hands in a little easier than before.


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Discussion Starter #6
Before I did the Swap to GL1500 Coils I did a search on this site to see how many failures that I could find for the GL1500 Coils & Pulse Generators.

I could Not find any GL1500 Coils that have failed, well at least none that were posted.

I believe that the GL1500 Coils are more robust and can handle more Heat than the 4cylinder coils can, this would provide a much longer life span.

I also have a pair of Pulse Generators from a GL1500, sitting on the shelf waiting for one of my 4cylinder bikes PG's to fail so that i can install them into the 4cyl. bike.

The GL1500 PG's are also better isolated from heat and seem more robust, I have not seen any GL1500 PG's fail either.

4cylinder Goldwings are much more prone to failure of the coils and PG's than 6cyl. wings are.
 

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Some information is missing here. Which color wires go to which coil and which plug wires go from which coil to which plug.
 

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Discussion Starter #8
Some information is missing here. Which color wires go to which coil and which plug wires go from which coil to which plug.

I wired up my new MP08 coils identical to stock 83' OEM specs only difference is now you have different coils in position, Plugs wires are also going to same cyl. and same position on the coils as stock OEM per the Honda service manual
 

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inevitable question that will come is how this might apply to 1100s?

then if if does apply, would it be a better way to go than the 'neon' upgrade option that is also well sorted out
 

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Got a set of 1500 coils & wires on the way. Gonna pull the carbs so, while I'm in there figured I would do this upgrade. Recently while on vacation the bike had to sit outside in the rain one night, the next morning it missed on 2 cylinders but it came out of it. Leads me to think small crack in one of the coils. Can't hurt

Rex
 

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I wired up my new MP08 coils identical to stock 83' OEM specs only difference is now you have different coils in position, Plugs wires are also going to same cyl. and same position on the coils as stock OEM per the Honda service manual
Did you extend the mounts as the 1500 coils are shorter than the 1100s.
Also, did you use the 1100 coil resistor?
 

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The missing could have been leaking plug wires or plug caps if they are still original. I had that on my 83A a few years back. Got 6' bulk 7mm plug wire and 4 new NGK plug caps and no more missing.

Got a set of 1500 coils & wires on the way. Gonna pull the carbs so, while I'm in there figured I would do this upgrade. Recently while on vacation the bike had to sit outside in the rain one night, the next morning it missed on 2 cylinders but it came out of it. Leads me to think small crack in one of the coils. Can't hurt

Rex
 

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Discussion Starter #13
Yes I removed the resistor
No I did not need to extend the mounts
I just used a few washers to get some spacing between the coil leads and the mounting bracket I just flip the stock brackets around so they mount up in the stock coil mounts that gives you the correct spacing
 

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Just did this update on my 1986 GL1200A. It now has 2 1500 coils I got off of ebay. 1 of the old coils had a crack, so it had weak spark on cyl. 1 & 2. It would run OK cool, but horrible when warm.

Used Twisty's method of 3/16" gap on extra plug to find the weak spark.

With new(used 1500) coils, the bike is now running better than ever. It has never started this good and has both great idle and low end power when it's warm or cold.

Many thanks to Westgl and others for all the great information.

I've been chasing this issue for some time now and once again am riding around with perma-smile. :)
 

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Discussion Starter #15
rmkrider Fantastic! Great Job!!

Glad to hear that it worked out for you.

The 86' GL12 that's a great bike.

I also Have a 86' GL12I, that I conveted to the GL1500 coils as well as my 83' GL11, but my 86' GL12 has been on a diet.

I dont know some how the fairing, the trunk, and saddle bags all flew off while i was riding one day, and this was what was under it all, see attached pictures

Now she is a 86' GL12N (N= Naked)

As far as the stock OEM coil mounts that came with your bike.

Did the GL1500 Coils mount as they did stock?

Did you end up using the GL1500 Spark Plug Wires that came with the coils?

My GL1500 coils mounted the same as the stock OEM coil location and in the bikes Oem mounting holes, as the stock OEM coils did stock.

After adding a couple washers between the wiring connections side of the coil(s) and the OEM coil mount that came with my bike.

This is provide some spacing between the metal coil mount and the coil connections, this is to avoid shorting to ground the coils wiring,

Then just flip the coil mounts around to get the proper mounting holes to line up with the frame mounting holes.
 

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Discussion Starter #16
inevitable question that will come is how this might apply to 1100s?

then if if does apply, would it be a better way to go than the 'neon' upgrade option that is also well sorted out
Hey pdbro,

I have no side by side comparison,

But I can say it is cheap, with many Parts available, and EASY to do mod,

I did not have to make any brackets, I used the brackets that came with my bike, the stock oem coil mounting brackets, this is a simple bolt on mod./upgrade

Mounting was very easy and as it was with OEM mounting, coil wires are included, just cleaned them up using some old Brake fluid I had after draing brakes on one of my bikes, it make the rubber softer, and removes most if not all the dirt from the coil wires to make them look much better than when you receive them, near new, depending on how long you leave on the brake fluid on before wiping it off.

GL1500 production date; 1988' to 2000' a 12 year run, this provides many used parts.

It was a upgrade to my 83' GL11, as I have a significantly hotter spark now than i had before the GL1500 coils, that is a noticeably hotter spark when looking at spark plug fire jump, and in starting, and riding performance.
 

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Westgl,

Here are my answers to your questions...

Did the GL1500 Coils mount as they did stock?


Similar to you, when swapping in the gl1500 coils to the 86 gl1200A mounts, I added a couple washers to gain some space for the connectors. Also, since the coils are shorter, I found a short slotted flat chunk of shelving mount I had laying around and used that to extend the coil pack mount to match the holes on the bike frame. Just added that to the front side and used the same rear factor mount to keep easier access to plug wire screw connectors. Sorry, no pics.

Did you end up using the GL1500 Spark Plug Wires that came with the coils?


I did use the gl1500 wires as they seem in good shape. Also like you I use one straight boot and one angled boot to give it a cleaner finished look. Same as your pics.

Still amazed at how much better the bike starts now. Thanks again!!
 

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Discussion Starter #18
Great rmkrider,

Your information may help someone else decide which way they want to go.
 

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westgl:

Many, many thanks for sharing your discovery. I just completed swapping out my coils, as the left coil died - no spark to 3-4. I had cleaned/rebuilt/synced the carbs on my 86 1200A using Randakk's kit, including cleaning the idle mixture jets and adjusting the floats. I could not get the idle to stabilize at a constant RPM. And she'd backfire thru the plenum between 1300-3000 RPM when out driving. I was giving the idle mixture screws 1 final adjustment before removing the carbs to give them a good soak in Pine-Sol when it started running on just the front 2 cylinders. I got some GL1500 coils off a 99 Valkerie on ebay and installed them. I used the spark plug wires as well, but swapped the wire for cyl-4 with the one from cyl-5 as it was a little longer. WOW!!! What a difference. She idles beautifully now and runs like a rocket. No more low-end backfiring either. And it was a plug-n-play mod. I didn't use the OEM bracket which holds the 3 sets of wire plugs and just reversed the front mount. The coils lined up perfectly with the original mounting holes. I did put a couple of washers on the mounts by the wire terminals, just to ensure there would be no surprises. Thanks again...
 

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Discussion Starter #20
westgl:

Many, many thanks for sharing your discovery. I just completed swapping out my coils, as the left coil died - no spark to 3-4. I had cleaned/rebuilt/synced the carbs on my 86 1200A using Randakk's kit, including cleaning the idle mixture jets and adjusting the floats. I could not get the idle to stabilize at a constant RPM. And she'd backfire thru the plenum between 1300-3000 RPM when out driving. I was giving the idle mixture screws 1 final adjustment before removing the carbs to give them a good soak in Pine-Sol when it started running on just the front 2 cylinders. I got some GL1500 coils off a 99 Valkerie on ebay and installed them. I used the spark plug wires as well, but swapped the wire for cyl-4 with the one from cyl-5 as it was a little longer. WOW!!! What a difference. She idles beautifully now and runs like a rocket. No more low-end backfiring either. And it was a plug-n-play mod. I didn't use the OEM bracket which holds the 3 sets of wire plugs and just reversed the front mount. The coils lined up perfectly with the original mounting holes. I did put a couple of washers on the mounts by the wire terminals, just to ensure there would be no surprises. Thanks again...

Hey Ripsnort,

I am glad the GL15 MP08 coil conversion worked out for you.

I have converted both my 83' GL11 & My 86' GL12.

I let my brother in law ride my 86' GL12, that was all it took, now he caught a bug in his third eye, and wants to convert it right away.

Thats ok though, it will run much better when finished.

My brother in law wants to bring his bike (a 78' GL10, that has a 75'GL10 engine in it) over to my house in a few weeks so that we can do this MP08 Coil Conversion on his bike, we are also doing a single carb conversion on it at the same time.

He has a CI Alum. intake manifold and we will be modding it to reduce the id of the runners down to 1.00"ID from 1.500"ID
 
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