Right bank firing weak


Information and questions on GL1200 Goldwings (1984-1987)
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steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Right bank firing weak

Postby steve allen » Sat Oct 18, 2014 9:25 pm



I have an 87 Aspy 1200 that after replacing head gasket and checking timing, found that the right side has a miss while idling and the exhaust is not as hot as left bank. Friend said he thinks the fire is weak on 1-3 cylinders. Is this just a coil replacement or is there more? I had the head redone at machine shop and they replaced valve guides and cleaned and checked everything. I used OEM gasket this time after using aftermarket one before. Last replacement lasted only 700 miles before leaking, cause I didn't clean block enough and used generic gasket. Thanks, Steve



User avatar
virgilmobile
Posts: 7647
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: Right bank firing weak

Postby virgilmobile » Sat Oct 18, 2014 10:33 pm

Before you replace the coils,check the volts feeding the coils.expect 12.8 at a idle of 950 rpm at least.

steve allen
Posts: 149
Joined: Thu Nov 19, 2009 8:51 am
Location: theodore, al
Motorcycle: 1987 1200 Aspencade
1994 GL1500 SE
1995 CB1000

Re: Right bank firing weak

Postby steve allen » Sun Oct 19, 2014 6:50 am

virgilmobile wrote:Before you replace the coils,check the volts feeding the coils.expect 12.8 at a idle of 950 rpm at least.

And if the voltage is good? If the voltage is not 12.8 or there abouts, then what? Steve

User avatar
virgilmobile
Posts: 7647
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: Right bank firing weak

Postby virgilmobile » Sun Oct 19, 2014 2:05 pm

If the voltage is low,use a wire from the battery(assuming it above 12.8 volts,and attach it direct to the coils.You can leave the existing wire there too.Just get the volts up for a test.See if the spark improves.if it does,suspect the kill switch being corroded or the same in the ignition switch.
Trace down the voltage loss.
If the volts are good,move to the ignition module wiring.That module needs a ground.Its on a green wire.They can corrode in the plug or at the ring connector that's bolted to the frame.

The coils can be ohm measured,including the ignition wires and resistor caps.Do measure them.




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