Does this sound rough?


Information and questions on GL1100 Goldwings (1980-1983)
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kotkinjs1
Posts: 28
Joined: Thu Jul 01, 2021 8:26 pm
Location: Wesley Chapel, FL
Motorcycle: 1982 GL1100

Does this sound rough?

Post by kotkinjs1 »



Another question.....after the starter replacement, new plugs, and I trimmed back that nasty looking #1 plug wire at the coil end to get a better connection, it runs better but not by much. To recap till now, before I replaced the plugs and trimmed the #1 wire, the #1 cylinder was cool to the touch for a good few minutes after start, there was some white smoke out of the right exhaust, and it took a good few tries to get it started and keep it running. Now the exhaust output are both warm, all the headers are hot almost right away, no smoke, and it'll stay running after the first start if I keep it revved for a little bit (to 1500 or 2k for 30 seconds or so to ensure it stays running).

Now, while it gets warmed up it seems the right side exhaust definitely sputters to life slower than the left. But once it's warmed up it runs smoother if not perfect. It's hard to hear maybe in the video but the right exhaust isn't as 'rhythmic' or smooth as the left. A little choppier?

Any ideas?



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Chewy
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Location: Readyville, TN United States
Motorcycle: 1980 1100i Interstate
1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

what kind of carb setup are you using?
kotkinjs1
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Re: Does this sound rough?

Post by kotkinjs1 »

Chewy wrote: Mon Aug 16, 2021 11:13 pm what kind of carb setup are you using?
Sorry, it's a single carb. Clone VW PICT28 I think. Or 30. But it ran fine if I remember before all the starter issues began about a month ago (it's a new to me bike).
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Chewy
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1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

i know a lot of people have had issues with a cylinder taking longer than the rest to come to life with the single carb setup. that could be the problem, but im not sure.
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Sig45227
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Re: Does this sound rough?

Post by Sig45227 »

Chewy, have you ever heard the root cause of this problem with certain cylinders taking longer to come to life?
Mine had similar issues, some exhaust pipes were much cooler.
Chewy wrote: Mon Aug 16, 2021 11:41 pm i know a lot of people have had issues with a cylinder taking longer than the rest to come to life with the single carb setup. that could be the problem, but im not sure.
kotkinjs1
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Re: Does this sound rough?

Post by kotkinjs1 »

Sig45227 wrote: Tue Aug 17, 2021 3:35 pm Chewy, have you ever heard the root cause of this problem with certain cylinders taking longer to come to life?
Mine had similar issues, some exhaust pipes were much cooler.
Chewy wrote: Mon Aug 16, 2021 11:41 pm i know a lot of people have had issues with a cylinder taking longer than the rest to come to life with the single carb setup. that could be the problem, but im not sure.
This is interesting....I'm obviously no expert but I've never heard of this. I can't figure out what the reason would be with the fuel/air mixture coming into the manifold at the same time when it's split to the different cylinders.

Sig, what did you end up doing if anything? Or did you just learn to live with it? I wonder if you could apply some backpressure to just the one exhaust?
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Sig45227
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Re: Does this sound rough?

Post by Sig45227 »

I haven't done anything but run the bike. The last month and a half has been spent resurrecting my bike for sale, but I may keep it if everything works as it should without issue. Once I get some actual miles on it I'll post up how it's running after getting a couple tank fulls through it.
kotkinjs1 wrote: Tue Aug 17, 2021 4:09 pm
Sig45227 wrote: Tue Aug 17, 2021 3:35 pm Chewy, have you ever heard the root cause of this problem with certain cylinders taking longer to come to life?
Mine had similar issues, some exhaust pipes were much cooler.
Chewy wrote: Mon Aug 16, 2021 11:41 pm i know a lot of people have had issues with a cylinder taking longer than the rest to come to life with the single carb setup. that could be the problem, but im not sure.
This is interesting....I'm obviously no expert but I've never heard of this. I can't figure out what the reason would be with the fuel/air mixture coming into the manifold at the same time when it's split to the different cylinders.

Sig, what did you end up doing if anything? Or did you just learn to live with it? I wonder if you could apply some backpressure to just the one exhaust?
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Chewy
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1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

Sig45227 wrote: Tue Aug 17, 2021 3:35 pm Chewy, have you ever heard the root cause of this problem with certain cylinders taking longer to come to life?
Mine had similar issues, some exhaust pipes were much cooler.
Chewy wrote: Mon Aug 16, 2021 11:41 pm i know a lot of people have had issues with a cylinder taking longer than the rest to come to life with the single carb setup. that could be the problem, but im not sure.
from what i understand it has to do with the extra distance the atomized fuel has to travel and some of the fuel condensing before it gets there. im also no expert in this area.
ive ran across a few guys irl, that had a dual carb setup. one above each set of cylinders. they seem to work really well in that i could not tell a difference in performance between their carb setup and my stock system.
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Chewy
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1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

will you post some pics of the carb and manifold setup?
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Sig45227
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Re: Does this sound rough?

Post by Sig45227 »

Too bad downdraft carbs were not a thing back then, at least in the motorcycle world. A couple of big semi-flat slide 38mm or larger downdrafts off a more modern sportbike would be great.
Chewy wrote: Wed Aug 18, 2021 8:50 am
Sig45227 wrote: Tue Aug 17, 2021 3:35 pm Chewy, have you ever heard the root cause of this problem with certain cylinders taking longer to come to life?
Mine had similar issues, some exhaust pipes were much cooler.
Chewy wrote: Mon Aug 16, 2021 11:41 pm i know a lot of people have had issues with a cylinder taking longer than the rest to come to life with the single carb setup. that could be the problem, but im not sure.
from what i understand it has to do with the extra distance the atomized fuel has to travel and some of the fuel condensing before it gets there. im also no expert in this area.
ive ran across a few guys irl, that had a dual carb setup. one above each set of cylinders. they seem to work really well in that i could not tell a difference in performance between their carb setup and my stock system.
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Chewy
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1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

Sig45227 wrote: Wed Aug 18, 2021 9:25 am Too bad downdraft carbs were not a thing back then, at least in the motorcycle world. A couple of big semi-flat slide 38mm or larger downdrafts off a more modern sportbike would be great.
Chewy wrote: Wed Aug 18, 2021 8:50 am
Sig45227 wrote: Tue Aug 17, 2021 3:35 pm Chewy, have you ever heard the root cause of this problem with certain cylinders taking longer to come to life?
Mine had similar issues, some exhaust pipes were much cooler.

from what i understand it has to do with the extra distance the atomized fuel has to travel and some of the fuel condensing before it gets there. im also no expert in this area.
ive ran across a few guys irl, that had a dual carb setup. one above each set of cylinders. they seem to work really well in that i could not tell a difference in performance between their carb setup and my stock system.
I wonder how hard it would be to fab the manifolds to use those type of carburetors?
kotkinjs1
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Re: Does this sound rough?

Post by kotkinjs1 »

This is my compression. Seems pretty balanced. The #2 cylinder is obviously what I was worried about but it's equal to the others.

Chewy.....here's the setup. Sorry for the photos, didn't have time to take the seat and false tank off at the moment. Pretty standard setup though it seems. I don't know who made the manifold unfortunately.












kotkinjs1
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Re: Does this sound rough?

Post by kotkinjs1 »

Oh shoot, I just realized I didn't have the throttle wide open when I hit start. 😖 I guess that would make the readings higher?
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Chewy
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1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

I am making the assumption that the intake plenums are original, and that everything else was adapted to that. I would check the vacuum pool on each plenum to see if it's even across each cylinder. That could give you more information as to what is going on.
kotkinjs1
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Re: Does this sound rough?

Post by kotkinjs1 »

Chewy wrote: Wed Aug 18, 2021 5:29 pm I would check the vacuum pool on each plenum to see if it's even across each cylinder.
Unfortunately, and in all honesty, I don't know what any of that means. :oops: I'll google some and check the parts names in my manual. But the intake manifolds are original as far as I know.
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Chewy
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1983 1100a Aspencade

Re: Does this sound rough?

Post by Chewy »

kotkinjs1 wrote: Wed Aug 18, 2021 7:36 pm
Chewy wrote: Wed Aug 18, 2021 5:29 pm I would check the vacuum pool on each plenum to see if it's even across each cylinder.
Unfortunately, and in all honesty, I don't know what any of that means. :oops: I'll google some and check the parts names in my manual. But the intake manifolds are original as far as I know.
look up the procedure on here about synchronizing stock carbs. you will see what im talking about.
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Re: Does this sound rough?

Post by WingAdmin »

kotkinjs1 wrote: Wed Aug 18, 2021 4:18 pm Oh shoot, I just realized I didn't have the throttle wide open when I hit start. 😖 I guess that would make the readings higher?
Correct, it should be wide open. Otherwise unsynchronized carbs can cause unbalanced compression values.


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