VERY low vacuum on idle

Information and questions on GL1100 Goldwings (1980-1983)
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Posts: 56
Joined: Thu Apr 05, 2012 11:52 am
Location: Tel Aviv, Tel Aviv, Israel
Motorcycle: 1980 gl1100

VERY low vacuum on idle

Post by shocko » Sun Oct 20, 2013 2:42 pm

trying to sync carbs after cleaning!!

connected all carbs to the sync gauges , here is where the the problem starts.
low vacuum , idle speed takes long to come down before the carbs settle
down. can't balance carbs due to low vacuum as when I stop the fluttering the gauges go to zero??
can any one advise what to do

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Posts: 87
Joined: Thu Aug 08, 2013 2:33 pm
Location: Grimsby , England - United Kingdom
Motorcycle: 1983 GL1100AD
1980 CB400N

Re: VERY low vacuum on idle

Post by David-Mantle » Mon Oct 21, 2013 12:47 am

If this were me I would screw in the adjuster till I have tick over then sync from there. As each carb comes into line you should find the tick over increasing naturally. As this happens then screw out the adjuster a little to slow tick over to about 1000 to 1200rpm. I would then proceed to repeat with all carbs until fully synced . When fully synced I would adjust tick over to about 950rpm. On a good day ( weather being perfect and engine warm ) my 1983 GL1100AD can tick over at a steady 600rpm but I only run this slow as a final check for perfect synchronisation. Running this slow is not advised for lengthy periods because oil pressure would be seriously compromised.

Just my way of doing things but hope it helps.
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