Carb synchronizer readings


Information and questions on GL1100 Goldwings (1980-1983)
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Darren S
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Motorcycle: 1983 Honda Goldwing Interstate Gl1100I

Carb synchronizer readings

Post by Darren S »



My readings on my synchronizer for a 1983 GL1100 are as follows #1 26 #2 25 #4 21 but #3 is off the scale. Had new kits put in. Rpms are a little high at 1600. Are there any suggestions what I could do to lower carb number 3. Thanks


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winguyjo
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Re: Carb synchronizer readings

Post by winguyjo »

carb 3 is the "base" carb. lower rpms then balance 1 to 3, then 2 to 4, then left bank to right bank. youtube has some good vids on the matter.
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Darren S
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Re: Carb synchronizer readings

Post by Darren S »

The rpms doesn’t want to come down. I am thinking there is some thing going on inside #3. Idle screw movement doesn’t change the rpm much.
MattMcCoy
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Re: Carb synchronizer readings

Post by MattMcCoy »

How are the throttle cables—routed and adjusted correctly? The throttle should snap closed when released.
LAB3
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Re: Carb synchronizer readings

Post by LAB3 »

An intake leak could cause the issue you describe, a quick shot of WD-40 or similar at the elbow where the carbs go into the heads should help you know if that's the case. Give both sides of the elbow a quick squirt and if the RPM's change, you'll know there's a leak.
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Darren S
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Re: Carb synchronizer readings

Post by Darren S »

I tried spraying with starter fluid, there was no difference. I will try the we 40 to see what happens. thanks
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Darren S
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Re: Carb synchronizer readings

Post by Darren S »

Hi Matt the throttle goes back when you let go the handle but it does snap like you are talking about. I certainly not ruling about a problem with the throttle. I had the bike all taken apart I will have to check the routing of the cables. Could the big spring in the linkage be weakened causing the problem
LAB3
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Re: Carb synchronizer readings

Post by LAB3 »

Darren S wrote: Wed Jun 16, 2021 1:57 pm I tried spraying with starter fluid, there was no difference. I will try the we 40 to see what happens. thanks
You've probably already answered that question. The main reason I'd suggest WD-40 is that starting fluid is awfully volitile and would make it to the airbox causing the RPM's to go up, WD-40 is a bit more localized.
MattMcCoy
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Re: Carb synchronizer readings

Post by MattMcCoy »

Darren S wrote: Wed Jun 16, 2021 2:12 pm Hi Matt the throttle goes back when you let go the handle but it does snap like you are talking about. I certainly not ruling about a problem with the throttle. I had the bike all taken apart I will have to check the routing of the cables. Could the big spring in the linkage be weakened causing the problem
You could unhook the cables and test the throttle spring on the carb rack as part of your troubleshooting. If it snaps closed when you open it, the cables need attention.

I would start with the basics and check that I have good spark, valves are adjusted to spec, carbs are cleaner than clean, idle mixture screws are 3 turns out, all the bolts/screws are tight on the intake runners and air box, and that my sync kit is properly set up. If all checks out, I would put a mirror down the plenum and blip the throttle to see if a CV slide is sticking.
JoBoy68
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Re: Carb synchronizer readings

Post by JoBoy68 »

when the Carbs were rebuilt were the " Air Cut off Valves " replaced each carb has one and they control the Vacuum if one is leaking it can cause all kind of weird stuff to happen my carb kits did not include them if you want to see what they look like go to Goldwingparts.com page #9
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Darren S
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Re: Carb synchronizer readings

Post by Darren S »

Yes the air cuts offs were replaced.
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Darren S
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Re: Carb synchronizer readings

Post by Darren S »

First of all thank you for the information. What I found out was that # 3 spark plug was not functioning correctly. It was brand new, as were the other three. Once I changed the plug jump on the bike and has been riding it ever since. Thanks again guys.
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Re: Carb synchronizer readings

Post by WingAdmin »

Darren S wrote: Sun Jun 27, 2021 2:56 pm First of all thank you for the information. What I found out was that # 3 spark plug was not functioning correctly. It was brand new, as were the other three. Once I changed the plug jump on the bike and has been riding it ever since. Thanks again guys.
Wow, that doesn't happen often. In fact, I can't say I've ever come across a plug that was defective out of the box. Thanks for following up and letting us know.
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OldguyGlen
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Re: Carb synchronizer readings

Post by OldguyGlen »

Also never found a bad plug "out of the box". But what I'm trying to rationalize is how a bad plug can cause a high idle and excessive vacuum on the #3 base carb ???


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