Help -Spark problem on No 2


Information and questions on GL1200 Goldwings (1984-1987)
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loopy
Posts: 64
Joined: Mon Nov 22, 2010 5:32 am
Location: Australia
Motorcycle: 1985 1200 interstate

Help -Spark problem on No 2

Postby loopy » Sat May 21, 2016 10:18 pm



I have tracked down a spark issue with my 1200 running on what feels like 3 1/2 cylinders ( not rough enough for only 3.) at cylinder No 2.

I have fitted new plugs, checked the spark plug wire and all is good.
Still No 2 has a very weak spark and appears not sparking all the time at all.

I have swapped the leads but appears the port from the coil is not supplying strong if not any spark.

My question is : Do I now have to replace the coil or is there something else I also need to check?



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Aussie81Interstate
Posts: 683
Joined: Thu Nov 27, 2014 2:34 am
Location: Penrith Australia
Motorcycle: 1982 CX500 Turbo (restoration project)
1981 GL1100 Interstate (sold)
1988 GL1500

Re: Help -Spark problem on No 2

Postby Aussie81Interstate » Sat May 21, 2016 11:50 pm

How about the spark plug cap - is there a resistor in it. what is the resistance of the cap only compared to the other three - also what style of lead are you running - the original style copper or carbon?

I would check the coils as well if you can get to them.

Resistance checks for caps, plug leads and coils might show up where the problem is.

cheers

On my old GL1100 - I changed the plug wires for copper leads and new caps - and it ran smooth as silk after that - with new and clean connections. If you have copper leads - you could trim 1/2 inch off the coil ends and then push them back in, and screw the grommets down firmly - makes for a newer clean connection as well, same for the cap ends.

loopy
Posts: 64
Joined: Mon Nov 22, 2010 5:32 am
Location: Australia
Motorcycle: 1985 1200 interstate

Re: Help -Spark problem on No 2

Postby loopy » Sun May 22, 2016 1:24 am

I swapped leads and still no spark ir very little from no 2 coil.
How do i check the coil

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skier
Posts: 154
Joined: Sun Jul 17, 2011 11:57 am
Location: Coon Rapids MN
Motorcycle: 1987 GL1200I 124k
2009 Honda Silverwing 14k -- the wife's scooter

Re: Help -Spark problem on No 2

Postby skier » Sun May 22, 2016 9:59 am

Each coil supplies spark to two spark plugs. If the coil was bad, I would expect a no/weak spark to both plugs.

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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: Help -Spark problem on No 2

Postby virgilmobile » Sun May 22, 2016 1:39 pm

Get a DVM attached to the frame and the black wire (12 volts) that feed the coils.Start the bike and hold around 2500 RPM.measure the volts..move your meter to the battery positive post and measure the volts.There should be no more than 0.6 volts difference.
You may be suffering from "not enough power" to the coils.

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: Help -Spark problem on No 2

Postby virgilmobile » Sun May 22, 2016 1:44 pm

Also.keep in mind that the entire ignition system is comprised of just a couple of parts.
A pair of ignition coils.
A pair of ignition modules.
A pair of pulse coils.
There is a common power and common ground.
Do look at the ground connections for the module and the 4 wire pulse coil connector for corrosion.




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