81 GL1100 Carb Vacuum


Information and questions on GL1100 Goldwings (1980-1983)
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a3west
Posts: 3
Joined: Mon Sep 01, 2014 3:41 pm
Location: Bellevue, MI
Motorcycle: 1981 GL1100 Interstate

81 GL1100 Carb Vacuum

Postby a3west » Sat Mar 21, 2015 2:41 pm



Hello, I did a carb sync today and noticed I am only pulling a little over 3 in. of vacuum at idle on the #3 carb. Does this seem normal? All the carbs were close to that value, so it took some minor tweaking to get them all the same, but 3 in. seems low. Also, the revs stay up for a few seconds after I give some throttle. Thanks



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virgilmobile
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Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
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Re: 81 GL1100 Carb Vacuum

Postby virgilmobile » Sat Mar 21, 2015 10:09 pm

The numbers are not important....only that all 4 carbs pull the exact same vacuum at 850-900 rpm.
Remember,the gauge is showing the vacuum for just one cylinder of a 1100cc engine...its not like the intake manifold vacuum of a Dodge 383.
Slow return to idle...Look at the slides with a mirror to be sure they close when the throttle is backed off.They rise and drop proportional to air flow.See if one is sticking up.
Also verify the throttle cables are snug and the link arms on the throttle body are secure in the bushings.

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a3west
Posts: 3
Joined: Mon Sep 01, 2014 3:41 pm
Location: Bellevue, MI
Motorcycle: 1981 GL1100 Interstate

Re: 81 GL1100 Carb Vacuum

Postby a3west » Sat Mar 21, 2015 10:19 pm

Thanks for the info. I found tonight after messing with it that I screw with the idle adjustment too much, and need to what until the bike is warm because I had the idle up too high. I think I will check out the slides and cable though to be safe. The bike sat for close to 30 years, so I'm sure it needs to be looked at.

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PastoT
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Joined: Sun Jul 01, 2012 9:20 pm
Location: Mt Home, Idaho
Motorcycle: 2002 GL1800 (107k)

Re: 81 GL1100 Carb Vacuum

Postby PastoT » Mon Mar 30, 2015 5:00 pm

Sticky and gunked up valves also will impact vacuum. If this bike has been parked that long I'd be sure to run it to temp a few times and flush the engine with seafoam and bring some clean oil/ filter and fresh fuel with fuel system cleaner to its rescue. Heavy use of some carb cleaner surely will help as well if not already applied. I haven't had to sync carbs in 20 years, but came across issues a few times on friends bikes that also had been stored or just never received their due TLC.


Tom, in Mountain Home, Idaho
2002 GL1800 (Illusion Red) Non-ABS, 108k miles
Retired Air Force

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