1981 GL1100i ignition coils


Information and questions on GL1100 Goldwings (1980-1983)
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Bill Powell
Posts: 18
Joined: Mon Jun 27, 2011 12:26 pm
Location: Vine Grove, KY
Motorcycle: 1981 GL1100I Interstate
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1981 GL1100i ignition coils

Postby Bill Powell » Wed Jul 06, 2011 12:21 pm



I'm trying to figure out if I have a bad ignition coil. I had my bike running last night and the carbs are not tuned from a recent rebuild yet. The idle has been rough and sometimes hard to start. The engine was running and I had the idea of pulling the number 2 cylinder spark plug wire off. The engine continued to run with no change. I put it back on and then pulled number 4. The engine died. After re-starting, I pulled number 1 and again NO change in the engine idle or sound. When I pulled number 4, the engine again died.

Reading about the coils and the ignition system of the GL1100's. I found that this ignition system is different in that no points are involved. The cylinders fire together, but on different revolutions of the order. (intake and exhaust)

I'm guessing that I have one coil that's bad. Is it normal for only one coil to go bad at a time?? or should I expect the second to go bad soon??

Bill



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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: 1981 GL1100i ignition coils

Postby virgilmobile » Wed Jul 06, 2011 12:41 pm

Just because you pulled one wire and it didn't change only means that cylinder is not firing.pull that wire again and stick an old plug on it to verify that it indeed has no spark.

If there is no spark on 2 cylinders,first swap the wiring to verify the coil is bad.It could be the ignition module or pickup coil.
To test this,just look for the missing spark,then swap the yellow and yellow/bl wires on the coil and recheck the spark.If the missing spark follows the wire,the coil is the problem.
If not,under the false tank,left side are a pair of ignition modules.Just unplug and swap them.if the spark follows them ,one is bad.
The pulse coil can be tested for continuity at the plug.
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Last edited by virgilmobile on Wed Jul 06, 2011 12:53 pm, edited 1 time in total.

Bill Powell
Posts: 18
Joined: Mon Jun 27, 2011 12:26 pm
Location: Vine Grove, KY
Motorcycle: 1981 GL1100I Interstate
Contact:

Re: 1981 GL1100i ignition coils

Postby Bill Powell » Wed Jul 06, 2011 12:53 pm

I didn't think about the spare plug out of the motor while it's running or turning over. I'll give that a try tonight.

Thanks

User avatar
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: 1981 GL1100i ignition coils

Postby virgilmobile » Wed Jul 06, 2011 1:18 pm

If you do have spark and the engine revs OK ,sync the carbs.They can drop a cylinder at an idle and cause a bad idle and rattling.




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