Carb Sync


Information and questions on GL1100 Goldwings (1980-1983)
  • Sponsored Links
llang
Posts: 8
Joined: Wed Aug 21, 2013 1:05 am
Location: Mpls., MN
Motorcycle: 1982 GL 1100

Carb Sync

Postby llang » Wed Sep 18, 2013 12:23 pm



I have a GW 1100 and need to sync the carbs, I have looked on-site and found the proceedure which is very informative, however I can't keep it running below 2000 rpm's right now and was wondering if I should set the idle up to 2000 so I can do the sync or ???
It's not mentioned in the proceedure that's on-site.



User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Carb Sync

Postby virgilmobile » Wed Sep 18, 2013 12:43 pm

If it won't run below 2000 rpm,either the throttle controls are jacked way off(One open much further than another) or you have carb problems to start with..Usually the slow speed jets are plugged up.
Even with a poor sync to start with,the bike should be able to maintain closer to 1000 rpm(running badly) to even attempt to sync them..

At 2000 rpm,syncing the carbs is not needed....You could put the meters on them to see if the vacuum is close but you need a stable idle at 1000 rpm for the best results.

When the carbs are running right and synced accurately,the 1100 could idle down to 400 rpm...
you can hear every cylinder firing...

User avatar
virgilmobile
Posts: 7660
Joined: Sun Sep 19, 2010 5:39 pm
Location: Denham Springs,La.
Motorcycle: 1988 GL1500 I
Previously owned
78 GL1000
81 GL1100
82 GL1100 I
83 GL1100 I
83 GL1100 standard
84 GL 1200 I

Re: Carb Sync

Postby virgilmobile » Wed Sep 18, 2013 12:48 pm

I would adventure to guess that if you started it from cold and kept the engine rpm as low as possible....running it for 8 seconds ..shut it off...lightly tap each header..you'd find which cylinder is dead at a idle...
One fellow had a bike that would run at 2000 rpm a while ago(plugged carbs)...he found out that it was actually "idling" on just one cylinder....the other 3 were dead at a idle.
Opening the throttle let in more fuel through the main jets to get him going.

User avatar
Wingsconsin
Posts: 786
Joined: Tue Jul 10, 2012 1:47 pm
Location: Sussex, Wisconsin (West of Milwaukee)
Motorcycle: 2002 GL1800 - Pearl Orange
1996 GL1500 Aspencade - Pearl Blue
1992 GL1500 Aspencade -Candy Red
1983 Suzuki GS850GL - Blue & Black
Contact:

Re: Carb Sync

Postby Wingsconsin » Wed Sep 18, 2013 3:02 pm

IF the carbs are properly and completely cleaned ,
and the Floats are set Perfectly it will run pretty well with just a bench synch and idle near the 1100 mark...

After we did that..our 1980 GL1100 would not synch..
1 & 3 synched exactly and 2 & 4 also synched to each other..
But the 2 banks (Left & Right) would not synch together...

The ONLY way we could do this and keep it running while synching was a 2 man operation...
I person on the idle speed adjustment screw turning it up while the synch was being performed which drew down the idle considerably;
and the other on the manomoeter and synch screws adjusting, adjusting adjusting...

After a while the synch was perfect, and the bike never ran better...In fac the MPG went up by 10% as well...

Here is a COLD START video made a few days after that final perfect synch was done...

[youtube]

[/YouTube]
Postings are my opinions based on experience and acquired knowledge.
Your results may vary. Universal disclaimers apply.


Motorcycle Adventure Storys writen by me
http://neverlost-justexploring.blogspot.com/

User avatar
SteveB123
Posts: 842
Joined: Thu Apr 05, 2012 9:29 am
Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: Carb Sync

Postby SteveB123 » Wed Sep 18, 2013 3:30 pm

llang wrote:was wondering if I should set the idle up to 2000 so I can do the sync


Yes, of course you can.
Get so it's sync'd and able to run, then back down the idle to, well, idle, and sync at the correct rpm.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

User avatar
dingdong
Posts: 2864
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: Carb Sync

Postby dingdong » Thu Sep 19, 2013 7:18 am

Waste of time. At 2000 rpm the carbs are out of the idle circuits range. Carb sync is strictly an adjustment of the idle circuits. If your idle circuits are clogged there is no point to a carb sync. You have to get it down to 1000rpm.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

User avatar
SteveB123
Posts: 842
Joined: Thu Apr 05, 2012 9:29 am
Location: Winchester, Ontario, Canada
Motorcycle: 1982 1100I, 60A Poorboy, MSD coil

Re: Carb Sync

Postby SteveB123 » Fri Sep 20, 2013 6:17 am

dingdong wrote:Waste of time. At 2000 rpm the carbs are out of the idle circuits range. Carb sync is strictly an adjustment of the idle circuits.


No Sir.
Carb sync is an adjustment of the throttle plates.
Current:82 GL1100 Interstate, 60 Amp Poorboy, MSD coil
Previous: 93 GSX1100F Katana
82 GL500 Silverwing

User avatar
dingdong
Posts: 2864
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: Carb Sync

Postby dingdong » Fri Sep 20, 2013 6:33 am

SteveB123 wrote:
dingdong wrote:Waste of time. At 2000 rpm the carbs are out of the idle circuits range. Carb sync is strictly an adjustment of the idle circuits.


No Sir.
Carb sync is an adjustment of the throttle plates.


Correct. Brain fart. I mis-stated that (delete the word circuits) but the whole point is to adjust for a proper "balanced" idle. If the plates are open enough to keep the "idle" above 2000 rpm a proper sync isn't possible because the carbs are no longer in the idle circuits. He has to get the idle down to 1000 and keep it there. If the idle circuits are plugged it ain't gonna happen.
Tom

A well regulated Militia, being necessary to the security of a free State, the right of the people to keep and bear Arms, shall not be infringed.

User avatar
jeffcosmo
Posts: 50
Joined: Thu Aug 22, 2013 9:26 pm
Location: South Elgin, IL
Motorcycle: 1983 GL1100 Aspencade

Re: Carb Sync

Postby jeffcosmo » Mon Sep 23, 2013 10:13 pm

Syncronising carbies is a process to allow ALL the carbies to flow the same at ALL rpm. So, a sync done at 2,000 rpm is more effective to everyday running than a sync done at idle. And this is because the carbies, at idle, are on the throttle stop screws, whereas, at any rpm above idle, the carbies are on the throttle, so, to be effective, syncronisation must be done both at idle and at above idle, also known as off the idle stop screws. The two CAN be different, which will adversely effect running.

Cosmo




Return to “GL1100 Information & Questions”




Who is online

Users browsing this forum: No registered users and 2 guests