Pulse generator issues?


Information and questions on GL1100 Goldwings (1980-1983)
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Schwartzie
Posts: 3
Joined: Mon Jun 02, 2014 5:51 am
Location: Natick, MA
Motorcycle: 1981 GL1100I Interstate

Pulse generator issues?

Postby Schwartzie » Mon Jun 02, 2014 6:26 am



Hello to all...new member here! I replaced the stator and rectifier on my '81 Interstate a coupla seasons ago @ 37K. Last season the problem started. After a full day of touring it began losing power & barely made it to my buddy's house. Two opposing cylinders had no spark. The next morning we broke out the tools and.....it started & ran like new! A thousand plus miles later the problem has resurfaced & gotten progressively worse all at once. After 3 or 4 miles two cylinders cut out, followed shortly by the other two. Five or ten minutes of cool down & it restarts & I limp my way home. Coils & wires have been replaced to no avail. The pulse generators test out @ 519 and 533 ohms cold. Following this latest scenario I retested 'em hot and got 582 & 598 ohms. I'm at my wits end....



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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: Pulse generator issues?

Postby virgilmobile » Mon Jun 02, 2014 11:08 am

Well the "book" calls for 530 ohms ( +- 50) at 68*...no reference to when hot but I suspect that What you read would be OK...

The spark...There's just 3 parts that are needed to generate spark...
The pulse coil
The ignition module
The coil..
You eliminated one part...
You can have 5 possible problem areas...
1.Any corrosion at the pulse coil plug..This is very small voltages and just a little bad connection can kill the spark...
2.Same at the ignition module...
3.Let's not forget the KILL switch either....A bit of corrosion and there goes the available power to run the ignition....Take it apart and resurface the contacts...
4.It's possible that the pulse coils have become "thermal"..where they go open when hot...You would have to ohm measure or volt measure the pulse coil when it dies...
I posted this to help determine if the pulse coils quit..viewtopic.php?f=5&t=11800...
5.If after the connections have been confirmed,pulse coils tested when the bike quits,the only part left is the ignition modules...

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plumbermullins
Posts: 43
Joined: Sun May 01, 2011 9:48 pm
Location: Foxborough,ma
Motorcycle: 82 standard w/vetter & kg bags
77gl1000 standard

Re: Pulse generator issues?

Postby plumbermullins » Mon Jun 02, 2014 5:28 pm

Well schwartzie it's about time you listened to me and got on here :D the test for swystem by analog meter sounds like a good test try it and check connectors. remember though dielectric grease is just that die electric a slightly loose plug covered in dielectric will increase resistance, and I know you like DIELECTRIC grease.

Schwartzie
Posts: 3
Joined: Mon Jun 02, 2014 5:51 am
Location: Natick, MA
Motorcycle: 1981 GL1100I Interstate

Re: Pulse generator issues?

Postby Schwartzie » Wed Jun 04, 2014 7:42 am

I appreciate the info Virgilmobile. The spark units were replaced when I restored the bike-winter of '01-'02 & appear as new. Kill switch & connector for the pulse units are A-OK as well. When I did the resto, I started at the headlight & applied dielectric grease to all the connections bow to stern & have never had a corrosion issue in the 12 years I've ridden it.

What causes the "thermal" condition you mention concerning the pulse generators? I'll get a pair off Ebay, but am majorly bummed that they're no longer available new.

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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: Pulse generator issues?

Postby virgilmobile » Wed Jun 04, 2014 7:53 am

The thermal condition.
A crack in the connecting wire at the pulse coil(they are soldered)is the most likley problem.As the entire pulse coil gets hot and its innards expand,the electrical connection is broken.Cool it off,parts shrink and the connection is mechanically made again.
This also applies if the coil's copper winding has fractured too.
Using the volt meter directly across the pulse coil will confirm why it fails to spark.
As the engine misfires (if its the pulse coil opening up) the voltage would increase a bunch.Just like in the video.
If the voltage goes to zero,the problem is not the pulse coil.
Please assume nothing.any one of the 3 parts could fail,including the power feeding the coils.
Try to confirm what is failing before you just throw parts in.

Schwartzie
Posts: 3
Joined: Mon Jun 02, 2014 5:51 am
Location: Natick, MA
Motorcycle: 1981 GL1100I Interstate

Re: Pulse generator issues?

Postby Schwartzie » Wed Jun 04, 2014 8:06 am

The condition you describe sounds like my problem. Bike starts in the blink of an eye & runs like a Swiss watch. Four miles down the road it begins running rough. From previous experience it's now on two cylinders. Another few hundred feet & the fire goes out completely. A ten minute cooldown & the whole process begins anew.

I'll repost once repairs are completed. Many thanks for the insights....

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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: Pulse generator issues?

Postby virgilmobile » Wed Jun 04, 2014 8:49 am

Let us know what you find or need.
If you have trouble locating a set (someone) should have used ones laying around.




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