GL1200 Cylinders 1, 4 weak - pulling plug wires has no effect - Steve Saunders Goldwing Forums

 
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post #1 of 6 (permalink) Old 09-09-2018, 10:50 AM Thread Starter
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GL1200 Cylinders 1, 4 weak - pulling plug wires has no effect

I have owned and been riding this bike for over a year now. There were a lot of PO kludged things with it that I am slowly fixing as my limited time and $ allow. It has been running pretty well as far as I could tell, pulls easily up to 80 or 90 (no desire to go faster), starts up easily, no shaking or massive misfiring. I have had a feeling it may be a bit down on power (only wing I have ever ridden so no real frame of reference) and I know the carb sync is off.

I have noticed that adjusting the carb sync screw for #1 cylinder doesn't seem to do much at all. If it is backed out all the way the exhaust pipe stays mostly cold. If I screw it in, it warms up some but I see 0 difference in how the bike idles. I yanked the plug wire off and absolutely no change in how it idles. I'm definitely getting spark, the plug wire will arc to frame and I can hear it when I get it close to the plug. The carb bowl isn't dry, I get fuel dripping out when I unscrew the drain screw a bit. I assume I am getting at least some compression / ignition or the exhaust pipe wouldn't be getting hot.

The #4 cylinder doesn't seem to have the cold exhaust issue, but I can pull the plug wire from this one as well without any change so I know it isnt holding it's own either. If I pull the wire from 2 or 3 the bike dies.

I had replaced the plugs a few months back and don't remember noticing any difference in how it ran or any oddities in the coloring. I should probably give this another go.

I live in an apartment complex so I can't leave it partially torn down for several days at a time, and time/money/tools are at a minimum. I need some suggestions from you guys as to what I should do to continue troubleshooting and in what order. I don't want to just throw money at the thing because frankly I can't. Based on these symptoms, what should I logically do next? I am thinking at least new plugs and compression test? I am guessing a carb sync won't help until I can get all of the cylinders firing to the extent where I at least her a difference pulling plug wires?

Leaving this to the experts, I hope you guys can help me avoid just blindly taking stabs at things. Thanks!

Dan

1983 Vf750 Sabre
1987 GL1200 Goldwing Aspencade
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post #2 of 6 (permalink) Old 09-09-2018, 11:00 AM
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I really don't think it's that unusual for pulling a plug wire to not seem to make a difference at idle. Mine has been that way for a hundred thousand miles and still runs like a scalded dog when opened up.

When I noticed the oddity, I took it to the best GL mechanic in town and he said it was nothing to worry about.

If your compression is good, move on to an issue you can do something about.

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post #3 of 6 (permalink) Old 09-09-2018, 11:03 AM
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If the pipes are getting hot it must be firing. I would suggest a compression test and a synch.

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post #4 of 6 (permalink) Old 09-09-2018, 11:15 AM Thread Starter
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Ok, I guess first step is compression check.

Dan

1983 Vf750 Sabre
1987 GL1200 Goldwing Aspencade
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post #5 of 6 (permalink) Old 09-09-2018, 03:02 PM Thread Starter
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Compression is even at 130-ish all cylinders - throttle open and no plugs but with a battery probably at about 75%. So I am guessing the carbs are just not right. Will have to see if I can get it synched. I have problems with syncing, All the vacuum restrictors I buy don't seem to do enough to even out the pulses. Guess I am going to have to try some fish tank air valves and see if I can get it to sync.

Dan

1983 Vf750 Sabre
1987 GL1200 Goldwing Aspencade
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post #6 of 6 (permalink) Old 09-10-2018, 07:26 AM
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remove the manifolds and do a bench sync? probably 10 minutes.
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