84 gl1200a


Information and questions on GL1200 Goldwings (1984-1987)
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wingman2
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Motorcycle: 1984 gl1200a

84 gl1200a

Post by wingman2 » Mon Apr 10, 2017 3:00 pm



hi guys, got a 84 wing bike runs but not well i lose spark in cyl 2 and three. and help would be great.



wingman2
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Joined: Mon Apr 10, 2017 2:51 pm
Location: illiinois
Motorcycle: 1984 gl1200a

Re: 84 gl1200a

Post by wingman2 » Thu Apr 20, 2017 1:02 pm

hi guys just got a 84 goldwing bike has no spark coils check out stator and pulse gen are good poss bad cdi. any advise thanks

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virgilmobile
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84 GL 1200 I

Re: 84 gl1200a

Post by virgilmobile » Thu Apr 20, 2017 3:13 pm

There's just a couple parts used to make a good spark...The coils,Ignition module,pulse coils and POWER...


It's absolutely necessary that it has the proper voltage to operate it.
With your volt meter..attach its leads directly to the 4 wire plug feeding the ignition module..Positive lead on the black and negative lead on the green.Crank the bike..Voltage should stay above 10.5 volts to get a robust spark.
Do not use the frame or battery post for the meter ground please.Probe the green wire directly at the module.Corroded ground connections are possible.
a bad/corroded KILL switch can also interrupt the current path to the ignition.
Look for corroded connectors at the ignition module AND at the 4 wire pulse coil connector to the right of the battery...Had that on mine...white powder in the connector killed the pulses to the module.

wingman2
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Motorcycle: 1984 gl1200a

Re: 84 gl1200a

Post by wingman2 » Fri Apr 21, 2017 8:02 am

hi virgilmobile wingman2 here. took your advise i got volts 10.5 at plug. went threw the bike yesterday and checked everything out, all test came back with in specs, the bike will start and run ok when cold as it warms up cyl# 1 and 2 have weak spark, the coil for those cyls are getting a pluse from cdi unit, even if coil tsets are good can that coil be breaking down as it gets warm ,or is the cdi unit acting up? any ideas would be great thank you. i also checked PG when cold and hot omhs the same.

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virgilmobile
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Re: 84 gl1200a

Post by virgilmobile » Fri Apr 21, 2017 9:37 am

I do hope that the volts did come up above 12 volts when it was acting up?

wingman2
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Re: 84 gl1200a

Post by wingman2 » Fri Apr 21, 2017 10:29 am

yes it stayed above 12 volts

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virgilmobile
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83 GL1100 I
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84 GL 1200 I

Re: 84 gl1200a

Post by virgilmobile » Fri Apr 21, 2017 11:54 am

The last time I had a weak spark it was caused by a bad ignition coil but I was able to compare it with a working one.
I do suspect the coils.The only test other than substitution is a resistance measurement when there working (cold) and again when they act up (hot).
Generally when a ignition module is bad,its bad..
This problrm is sounding more like lack of power to the coils (tested OK) or the coils themselves.
In my best opinion you understand.

wingman2
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Re: 84 gl1200a

Post by wingman2 » Wed Apr 26, 2017 10:36 am

hi virgilmobile wingman2 here finally got more time took work my wing after goining over it did all test found fault coil for cyl 1 and 2 . got new coils on order should be here today. ill post with results . thanks for all the help.

wingman2
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Re: 84 gl1200a

Post by wingman2 » Thu Apr 27, 2017 9:22 am

hi virgilmobile wingman2 here got my coils in yesterday bike running great thanks for help

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virgilmobile
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83 GL1100 I
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84 GL 1200 I

Re: 84 gl1200a

Post by virgilmobile » Thu Apr 27, 2017 10:20 am

Great job.Learn something new every day.

JFRRACING
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Re: 84 gl1200a

Post by JFRRACING » Wed Aug 16, 2017 12:01 pm

virgilmobile wrote:
Thu Apr 20, 2017 3:13 pm
There's just a couple parts used to make a good spark...The coils,Ignition module,pulse coils and POWER...
gl1200 ignition.JPG
It's absolutely necessary that it has the proper voltage to operate it.
With your volt meter..attach its leads directly to the 4 wire plug feeding the ignition module..Positive lead on the black and negative lead on the green.Crank the bike..Voltage should stay above 10.5 volts to get a robust spark.
Do not use the frame or battery post for the meter ground please.Probe the green wire directly at the module.Corroded ground connections are possible.
a bad/corroded KILL switch can also interrupt the current path to the ignition.
Look for corroded connectors at the ignition module AND at the 4 wire pulse coil connector to the right of the battery...Had that on mine...white powder in the connector killed the pulses to the module.
Im testing the module like u stated here. should it be a steady or does it flash a number when it cranks over. my problem is im getting a very weak spark to all spark plugs. i replaced the coils with no difference. i tested the pulse gens like i read on here and im getting around 340 ohm like my manual says. i have searched all over and can't find much info about my problem

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virgilmobile
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83 GL1100 I
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84 GL 1200 I

Re: 84 gl1200a

Post by virgilmobile » Wed Aug 16, 2017 1:30 pm

Should it be steady or flash?
Hmmm.If your using a test light to see the volts feeding the ignition coils and the voltage path is weak...as each coil sparks there is a load and a bit of voltage drop is normal but not enough to see a test light blink.
Soooo....No you should not see a test light blinking or flashing.

By your description of weak spark and what I assume is a test light used to look at the volts,your problem is poor voltage feeding the ignition system.
Fortunately there is a cure for this but another test is needed.
Simply attach a fuse (10 amp) to the battery positive post and start the bike...temporarily attach the wire right to the black wire that feeds the ignition.Don't worry...there both 12 volts.
This bypasses all the bikes switches and connectors applying battery power direct.This should stop the flashing light indication and greatly improve the spark.
If it cures your spark problem you have 2 choices...Track down every bad connection and fix them or use a relay to bypass the poor circuit.
The relay modification is a approved method.I even use it on my 1500 ignition.
Now if it doesn't instantly stop the flashing,the next suspect is a corroded ground to the frame.

JFRRACING
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Re: 84 gl1200a

Post by JFRRACING » Thu Aug 17, 2017 9:04 am

virgilmobile wrote:
Wed Aug 16, 2017 1:30 pm
Should it be steady or flash?
Hmmm.If your using a test light to see the volts feeding the ignition coils and the voltage path is weak...as each coil sparks there is a load and a bit of voltage drop is normal but not enough to see a test light blink.
Soooo....No you should not see a test light blinking or flashing.

By your description of weak spark and what I assume is a test light used to look at the volts,your problem is poor voltage feeding the ignition system.
Fortunately there is a cure for this but another test is needed.
Simply attach a fuse (10 amp) to the battery positive post and start the bike...temporarily attach the wire right to the black wire that feeds the ignition.Don't worry...there both 12 volts.
This bypasses all the bikes switches and connectors applying battery power direct.This should stop the flashing light indication and greatly improve the spark.
If it cures your spark problem you have 2 choices...Track down every bad connection and fix them or use a relay to bypass the poor circuit.
The relay modification is a approved method.I even use it on my 1500 ignition.
Now if it doesn't instantly stop the flashing,the next suspect is a corroded ground to the frame.

Thanks for ur quick response. what i mean by weak spark is i pulled a spark plug to see what kind of spark i was getting on all 4 cylinders. The spark is very faint, not bright white more of a yellow/orange spark not like u would expect. i never used a test light on the green and black wires. i probed them with a multi tester like u stated to do. the number that i saw when cranking it over just flashes, won't stay on steady. i tried the jumper and got the same spark and the same. would the pulse gens cause a weak spark or do they just send a signal of when to fire the cylinder. i have owned this bike for 14 years and never had any ignition problems. the motor runs great at idle but once u put a load on it like from a dead stop u can tell it doesn't seem right. i just finished completely rebuilding the carbs and doing a poor boy conversion and everything turned out good but now i have this problem. thanks for ur help

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virgilmobile
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Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 84 gl1200a

Post by virgilmobile » Thu Aug 17, 2017 10:56 am

The pulse coils.Generally they either work or fail.I've never seen them weak.There purpose is to provide the computer with a reference signal for it to operate(pulse) the coil.
Poor spark has always been low volts or bad coils/wire.On my work bench,I attached a pulse coil, module and ignition coil to a battery...wiggled a screwdriver by the pulse coil and generated a 3/4" snap.
I'm most disturbed by your meter readings.I expect some variations as each coil loads(sparks) but only a few tenths of a volt.
I suspect your using a meter that cannot display the voltage changes fast enough thus the peculiar readings.
I will suggest working out this problem first.Easiest way...You already bypassed the power feed with no good results...the next step is the ground...You can also augment this line the same way.A direct connection to the battery ground post and the ignition module green wire.
One or both should get that voltage stable.
As I recall,the ignition module ground goes through the plug(check for corrosion) and to a ring connector bolted to the frame just under the module area.A point of corrosion also.
Simply put...there's only 4 things needed for a good spark...Volts,coil,module and pulse.

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virgilmobile
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Joined: Sun Sep 19, 2010 5:39 pm
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Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: 84 gl1200a

Post by virgilmobile » Thu Aug 17, 2017 11:40 am

I've pulled and linked a couple of videos I did relating to ignition.Neither are the 1200 but the basic parts are the same.Each video confirmed the need for a solid 12 volts.The hard to see video is just to demonstrate what a good and poor spark sounds like.On my 1500 the center coil was weak.You can hear the difference when the plug wire is lifted a inch away from the plug.The 1500 idled fairly well but didn't run out well above a idle.It doesn't take much power to spark at a idle but as the rpm increases so does the load on the 12 volt supply.If its not maintained above 12 volts,the spark gets poorly and misfires happen.






JFRRACING
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Location: south carolina
Motorcycle: 1985 1200 goldwing aspencade

Re: 84 gl1200a

Post by JFRRACING » Thu Aug 17, 2017 1:06 pm

virgilmobile wrote:
Thu Aug 17, 2017 10:56 am
The pulse coils.Generally they either work or fail.I've never seen them weak.There purpose is to provide the computer with a reference signal for it to operate(pulse) the coil.
Poor spark has always been low volts or bad coils/wire.On my work bench,I attached a pulse coil, module and ignition coil to a battery...wiggled a screwdriver by the pulse coil and generated a 3/4" snap.
I'm most disturbed by your meter readings.I expect some variations as each coil loads(sparks) but only a few tenths of a volt.
I suspect your using a meter that cannot display the voltage changes fast enough thus the peculiar readings.
I will suggest working out this problem first.Easiest way...You already bypassed the power feed with no good results...the next step is the ground...You can also augment this line the same way.A direct connection to the battery ground post and the ignition module green wire.
One or both should get that voltage stable.
As I recall,the ignition module ground goes through the plug(check for corrosion) and to a ring connector bolted to the frame just under the module area.A point of corrosion also.
Simply put...there's only 4 things needed for a good spark...Volts,coil,module and pulse.
Thanku for ur help i'll try this out. great videos . i know the spark im getting is nothing like that one.



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