Ignition mystery


Information and questions on GL1100 Goldwings (1980-1983)
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moritz1100
Posts: 67
Joined: Fri Mar 09, 2012 10:25 am
Location: ireland
Motorcycle: 1980 GL1100

Ignition mystery

Postby moritz1100 » Fri Jan 31, 2014 10:42 am



Really strange problem on my 80 gl1100. I installed new coils, ht leads, caps and plugs and all was well. Few days later I was riding in the rain and it started running really rough, sure enough when I got home I saw that the drain hole on nr 3 plug was blocked. Cleared it out and it was still running rough so I put in a new plug. Still running rough so I take off the cap while it's idling and there's no ticking sound out of nr 3 and 4 caps like there is on the other 2. Popped in a plug to check for spark and there is one but not very strong. So, I got my multimeter and checked the pulse generator for resistance and it's spot on at 530 ohms. Must be cdi right, swapped them and the problem is still on nr 3 and 4. So, I changed the connectors on the coils around and swapped the ht leads over to the other cylinder and the problem moves to nr 1 and 2. I noticed that the wires at the connector plug for the pulse generator(beside the battery) seem to be really soft like they're water logged or something but the numbers are bang on for the pg. Really stumped..



moritz1100
Posts: 67
Joined: Fri Mar 09, 2012 10:25 am
Location: ireland
Motorcycle: 1980 GL1100

Re: Ignition mystery

Postby moritz1100 » Fri Jan 31, 2014 10:49 am

Should mention that the roughness is only there at idle and when accelerating between say 5 and 20 mph but after that full power seems to be restored and it seems better when it's cold, only starting to get bad as it warms up.

sperryunivac
Posts: 57
Joined: Sat Apr 02, 2011 2:41 pm
Location: Mississauga, Ontario, Canada
Motorcycle: 1983 Goldwing Interstate
1969 Bsa Lightning

Re: Ignition mystery

Postby sperryunivac » Fri Jan 31, 2014 11:50 am

So, I changed the connectors on the coils around and swapped the ht leads over to the other cylinder and the problem moves to nr 1 and 2.

It appears that you have narrowed down you problem to the coil that originally fires nr 2 and nr 3. What you are saying above is that you effectively swapped out the coils?
Can you try your old coils to see if the problem clears up?

moritz1100
Posts: 67
Joined: Fri Mar 09, 2012 10:25 am
Location: ireland
Motorcycle: 1980 GL1100

Re: Ignition mystery

Postby moritz1100 » Fri Jan 31, 2014 1:35 pm

Just finished putting back in the old coils and the bike is perfect. wtf. Am I missing something here? Was speaking to a guy earlier and he thought the 1100's had some kind of resistor mounted between the coils, but the 2 I've owned didn't have anything like that. Maybe I was sent the wrong coils, they were advertised as gl1100 coils, however they don't have anything printed on them at all to identify them.

moritz1100
Posts: 67
Joined: Fri Mar 09, 2012 10:25 am
Location: ireland
Motorcycle: 1980 GL1100

Re: Ignition mystery

Postby moritz1100 » Fri Jan 31, 2014 1:50 pm

From another forum, 80-81 do not have a resistor between the coils because it is built into the cdi. What if my cdi is not original to the bike and came from a later model?

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WingAdmin
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Re: Ignition mystery

Postby WingAdmin » Fri Jan 31, 2014 2:29 pm

You said you moved the HT leads from one set of plugs and their coil to the other, and the problem moved with them. To me, that is showing the problem exists with the leads, or their connectors.

moritz1100
Posts: 67
Joined: Fri Mar 09, 2012 10:25 am
Location: ireland
Motorcycle: 1980 GL1100

Re: Ignition mystery

Postby moritz1100 » Fri Jan 31, 2014 2:39 pm

No, the leads stayed in their places on the coil end.. I'm fairly sure I got the wrong coils, looks like there's a difference between the "aw82" stamped ones on the '80 and '81 and the "bw82" coils on '82 and '83.




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