Good spark on 1 & 2 but nothing on 3 & 4


Information and questions on GL1200 Goldwings (1984-1987)
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rrumfelt
Posts: 5
Joined: Sun Jul 27, 2014 6:05 pm
Location: Opelika
Motorcycle: 1986 GL1200 ASpencade

Good spark on 1 & 2 but nothing on 3 & 4

Postby rrumfelt » Mon Jul 28, 2014 4:43 pm



'86 GL1200 Aspencade. I pulled and tested both coils. Primaries were 3.0 Ohms on both and secondaries were about 20K Ohms. Thus, both appear to be fine. (Of course, the coil that feeds 1 & 2 was known to be ok since 1 & 2 have great spark. The point is -- both coils tested identically suggesting that they're both fine.) With battery at about 11.7 volts (low due to not operating the cycle for awhile) I turned the key on (without starting) and get 10.4 volts on the Black/White wire coming from the Ignition Unit and 9.7 volts on both the Blue/Y and Yellow/B wires. Not sure why there's such a voltage drop??? In any case, it SEEMS like there is electric available to and through the left side coil but no spark at either 3 or 4. Since both coils checked out and the source of the problem is common to both 3 & 4 (since they are fed by the same coil), the issue seems like it has to be prior to the coil and before the electric "splits" to supply 1/2 and 3/4. I do not have any manuals or diagrams to work from so does anyone have an idea of where to look? I would also BEG for photo(s) showing where the components to check are located on an '86 GL1200 Aspencade. Thanks!



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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby virgilmobile » Mon Jul 28, 2014 5:16 pm

Clarify the numbers
Do the nonfiring plugs come off the same coil?
Cylinder 1 and 3 are on the right.2 and 4 the left.
Cylinder 1 is front right.2 is the opposing cylinder.
If its one coil,look close at the pulse coil plug(4 wire plug) to the left of the battery(if its a carb bike).for any corrosion.

rrumfelt
Posts: 5
Joined: Sun Jul 27, 2014 6:05 pm
Location: Opelika
Motorcycle: 1986 GL1200 ASpencade

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby rrumfelt » Mon Jul 28, 2014 5:22 pm

The non firing cylinders come off the same coil, the coil on the left (if seated to ride). #3 on the rear left and #4 on the rear right do not fire.

To complicate things, the 4-wire plug normally to the left of the battery had the connector cut off and (apparently) hard-wired. I cannot even find it!

Where can I find its terminal end so I can trace how the wiring was re-routed?
Last edited by rrumfelt on Mon Jul 28, 2014 5:37 pm, edited 1 time in total.

rrumfelt
Posts: 5
Joined: Sun Jul 27, 2014 6:05 pm
Location: Opelika
Motorcycle: 1986 GL1200 ASpencade

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby rrumfelt » Mon Jul 28, 2014 5:28 pm

FWIW, I have scoured the web for the location of the pulse generator on an 86 GL1200 Aspencade and have no found a single photo or diagram that shows its exact location. Would greatly appreciate if anyone would post that! (Not a big fan of blind troubleshooting.)

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HawkeyeGL1200
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Joined: Sat Jul 05, 2014 11:53 am
Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby HawkeyeGL1200 » Mon Jul 28, 2014 5:52 pm

I'm not a really good electrician. Some model Goldwings, and I can't recall if the GL1200 is one of them, use a ballast resister between the battery and coils to lower the primary voltage. That *could* be why you are seeing the voltage drop at the coils.

Pulse generator is located inside the timing belt housing cover behind the crankshaft pulley.

Look for the 4 pin connector again, slightly forward of the battery. The connector that has been removed is more than likely the Stator to Regulator/Rectifier push connector. Removal and hard-wiring of that connector is a common practice to prolong stator life due to corrosion in the connector being linked to Stator failure.

If you have spark out from one coil and voltage to both coils, I would check the plug wires where they screw into the coils. Then check the plug boots (inside) to see if the screws that hold the resistors are tight.. then I'd pull the plugs to make sure they aren't cracked. Stranger things have happened then to have a cracked (or two) plug. Maybe the last guy was ham-fisted and he damaged the plugs during installation (unless you put them in LOL)...
Last edited by HawkeyeGL1200 on Mon Jul 28, 2014 6:26 pm, edited 1 time in total.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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HawkeyeGL1200
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Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby HawkeyeGL1200 » Mon Jul 28, 2014 5:58 pm

The pulse generator on your year model is under the timing belt cover. I told you where mine is.
I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

rrumfelt
Posts: 5
Joined: Sun Jul 27, 2014 6:05 pm
Location: Opelika
Motorcycle: 1986 GL1200 ASpencade

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby rrumfelt » Mon Jul 28, 2014 6:09 pm

I have read several posts that indicate that starting in 1985 or 86 (can't recall) the PG is not in the rear but in the front. Before i tear the entire fairing and radiator off, I want to be 100% sure. :D

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HawkeyeGL1200
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Location: Courtland, Va.
Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby HawkeyeGL1200 » Mon Jul 28, 2014 6:21 pm

The pulse coils are located behind the crankshaft pulley, highlighted with the two arrows.
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I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.

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rjlv25
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1987 GL1200I Interstate
1982 GS1100L (SOLD)
1982 KZ1000LTD (SOLD)
1979 KZ750B4 (Traded)

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby rjlv25 » Mon Jul 28, 2014 6:24 pm

According to the Honda manual, starting in '85 the pulse generators are under the timing belt covers.

rrumfelt
Posts: 5
Joined: Sun Jul 27, 2014 6:05 pm
Location: Opelika
Motorcycle: 1986 GL1200 ASpencade

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby rrumfelt » Tue Jul 29, 2014 9:45 am

Thanks for the photo, (HawkeyeGL1200)! and post (rjv...) telling me the location. Great of you!

Figured out my issue.

Somehow, water (a lot of it) had gotten down into the well area of the #3 plug (not into the cylinder, of course) and was grounding out the plug. This also, apparently, grounded out the #4 plug since they are electrically on the same pathway. Dried it out and rechecked for spark. Viola! Reassembled and it runs like a champ now.

Thanks to those who tried to help.

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virgilmobile
Posts: 7663
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby virgilmobile » Tue Jul 29, 2014 10:48 am

Between the plugs,there is a drain hole.its probably plugged.Wiggle a small wire in it to clear.

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HawkeyeGL1200
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Motorcycle: 1984 GL1200 Interstate
1981 GL1100 Interstate

Re: Good spark on 1 & 2 but nothing on 3 & 4

Postby HawkeyeGL1200 » Tue Jul 29, 2014 1:12 pm

virgilmobile wrote:Between the plugs,there is a drain hole.its probably plugged.Wiggle a small wire in it to clear.


I have plenty experience with drown spark plugs due the drain being filled by small pieces of trash... even a mud-wasp managed to fill mine completely on a GL500 I rode for a time... I never even considered a water/spark problem...

FYI: If you have water in the plug recess... enough to cause a spark plug to ground to the engine... it is probably a good idea to remove the plugs boot(s) and hose the inside of the plug wire with some kind of contact cleaner... I use(d) WD-40 in mine when this has happened to me in the past.


I am wrong as often as I am right concerning what is wrong with someone else' motorcycle without having seen the machine in person. Guessing with limited information, as to the source of the trouble, is sketchy at best.


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