1984 gl1200 running on two cylinders


Information and questions on GL1200 Goldwings (1984-1987)
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piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

1984 gl1200 running on two cylinders

Postby piehl67 » Mon Jul 19, 2010 9:31 pm



i just bought an 1984 gl1200 and she is only running on two cylinders.the front two are firing and no spark out of the back two cylinders.tested coil and it is ok has new plugs and the power and ground to the back of the coil is all good.checked the pulse generator and ever tried to switch the two coils around and didnt change a thing does anyone have any ideas as to what to do next??? the people i got it from replaced the stator and rewired it could that have something to do with it? any help at all would be great and thanks in advance.



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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: 1984 gl1200 running on two cylinders

Postby WingAdmin » Tue Jul 20, 2010 11:06 am

The rear cylinders are run by the same coil - time to check to see if that coil is operating, both primary and high tension portions:
Attachments
4 Cylinder Wing Coil Wiring
4 Cylinder Wing Coil Wiring

piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

Re: 1984 gl1200 running on two cylinders

Postby piehl67 » Tue Jul 20, 2010 11:16 am

how do i go about doing that? i know the coil works becouse i switched it with the other side and still front two cylinders got spark.

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WingAdmin
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Posts: 17046
Joined: Fri Oct 03, 2008 4:16 pm
Location: Strongsville, OH
Motorcycle: 2000 GL1500 SE
1982 GL1100A Aspencade (sold)
1989 PC800 (wife's!)
1998 XV250 Virago (sold)
2007 Aspen Sentry Trailer

Re: 1984 gl1200 running on two cylinders

Postby WingAdmin » Tue Jul 20, 2010 11:23 am

Ok, so you've eliminated the coil itself and the high tension leads going to the plugs as possibilities. Is there power getting to the coil in question?

piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

Re: 1984 gl1200 running on two cylinders

Postby piehl67 » Tue Jul 20, 2010 11:46 am

i pulled the blue wire and the black/white wire off the back and tested with a volt meter with key on and there is 12v there.i didnt switch the plug wires only the coils. one thing i did find when i first got the bike is that the number 3 cylinder boot was unscrewed from the wire not sure how long it has been that way could it have burnt the resistor inside the boot?

piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

Re: 1984 gl1200 running on two cylinders

Postby piehl67 » Wed Jul 21, 2010 8:16 am

i was looking over the bike again last night and founf that they have the fuel pump hard wired and looked in the book and seen that the blue wire also goes to the fuel pump relay. started checking that out and all three wires to the fuel pump relay have continuity to ground when ohmed could this be an issue?

piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

Re: 1984 gl1200 running on two cylinders

Postby piehl67 » Thu Jul 22, 2010 11:05 am

does anyone have any more idea of what to try for no spark on the back two cylinders?

jdvorchak
Posts: 39
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Location: East Alton, IL
Motorcycle: 2001 GL1800
2000 HD Dyna FXDX
1984 GL1200 STD

Re: 1984 gl1200 running on two cylinders

Postby jdvorchak » Wed Jul 28, 2010 12:56 am

Unfortunately I had the same problem with an 84 GL1200 and it turned out to be the Ignition module. The way I narrowed it down was to follow the trouble shooting guide in the manual. It could also be your ignitor and only following the trouble shooting guide will get you to the correct defective part.

It's the most expensive part to replace but also the easiest part to change of the 3 components that makes up your ignition circuit.

Coils, ignitor, Ignition module.

jdvorchak
Posts: 39
Joined: Thu Jul 16, 2009 11:58 pm
Location: East Alton, IL
Motorcycle: 2001 GL1800
2000 HD Dyna FXDX
1984 GL1200 STD

Re: 1984 gl1200 running on two cylinders

Postby jdvorchak » Wed Jul 28, 2010 1:04 am

You have already established that the coils were good so on to the pulse generator (ignitor). Also I misnamed it it is the Ignition Control Module in my previous post.

This is from the gl1200 Service Manual:

TRANSISTORIZED IGNITION SYSTEM
PULSE GENERATOR INSPECTION
Remove the left side cover and disconnect the pulse
generator coupler. ( the 4 pin connector to the left of the battery right next to the 3 wires from the stator)
Measure the coil resistance between white/yellow
and yellow lead (No.1, 2 cylinders) or white/blue
and blue lead (No.3, 4 cylinders).
RESISTANCE: 1.1-1.3 Kohm at ZO°C (68°F)

IGNITION COIL
REMOVAL
Remove the top compartment.
Remove the air cleaner case and element holder
from the air chamber.
Remove the ignition control unit and relay bracket
by removing two bolt.

Disconnect the primary wires from the ignition
coils.
Disconnect the three coupler from the coupler
holder and remove the turn signal relay from the
ignition coil bracket.
Remove the ignition coils and cable guide by removing
two bolts.
Remove the spark plug wires from the ignition coil.

PRIMARY COIL INSPECTION
Check the resistance between the terminals with an
ohmmeter as shown. (pointing to the primary spade lug terminals)
RESiSTANCE: 2.4-3.0 ohm

Measure the secondary coil resistance with the
spark plug caps in place.
RESISTANCE: 20.1-27.9 Kohm

piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

Re: 1984 gl1200 running on two cylinders

Postby piehl67 » Wed Jul 28, 2010 8:19 am

thanks for the info. the fuel pump relay should be here today so if that dont fix it i will do the test that you posted.i have already done the test on the pulse generator and it checks out good.thanks again

piehl67
Posts: 15
Joined: Mon Jul 19, 2010 9:24 pm
Location: bluffton, oh
Motorcycle: 1984 gl1200 aspencade

Re: 1984 gl1200 running on two cylinders

Postby piehl67 » Wed Jul 28, 2010 8:40 pm

Thank you everyone for your time and help! It turned out to be the ignition module.

bigray122
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Joined: Wed Mar 24, 2010 7:37 am
Location: Dallastown, PA
Motorcycle: 1983 GL1100I

Re: 1984 gl1200 running on two cylinders

Postby bigray122 » Thu Sep 09, 2010 10:32 am

I sure do hope this is the fix for my bike. I have been using autolite plugs. Normally I get some miles out of them, then low and behold the number 2 cylinder plug fouls out as do the rest systematically. I know several factors are involved. The bike, even with fresh plugs, blows back smoke. Okay so I figure the rings are bad (replace rings right?), the carbs need to be cleaned and rebuilt & Syn'd. But the other night after getting NGK plugs, it started to foul the plugs (at lower idle city driving) very fast. No worries, went to work and then on the way home it felt as if the bike conked out as if it were outta gas. Finally got it restarted and a few miles later same damn thing.... kinda like the bike was dying and no matter how much throttle I gave it...sounded as if were choking and ultimately died. To make matters worse, the throttle cable broke...

snadams1
Posts: 5
Joined: Sat Feb 21, 2015 12:51 pm
Location: Tucson
Motorcycle: 1984 GL1200 Aspencade

Re: 1984 gl1200 running on two cylinders

Postby snadams1 » Sun Apr 12, 2015 3:48 pm

I have the same problems with my 1984 Aspy. Did you ever find out the problem.

Regards,

Steve

pcatarelli
Posts: 2
Joined: Mon Jun 16, 2014 4:59 pm
Location: shirley NY
Motorcycle: 1984 GL1200 Aspen

Re: 1984 gl1200 running on two cylinders

Postby pcatarelli » Wed May 27, 2015 6:37 pm

I have the same problem and have just started looking at the issue. Did you find the problem yet?




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