Carb Bench Sync

Post your "How To", or share tips and tricks about maintenance related to four cylinder Wings. Only registered users can read this forum.

Moderators: Whiskerfish, Forum Moderators

User avatar
Roady
Member Relations &_Graphics
Member Relations &_Graphics
Posts: 11837
Joined: Wed Jun 20, 2007 2:35 pm
Location: Belleville, IL

Carb Bench Sync

Post #1 by Roady » Wed Aug 14, 2013 7:49 am

The method for bench syncing the carbs has previously been to use a wire or needle as a feeler gauge between the throttle plate and carb body. But, when Mike Nixon, noted GL Carb Guru joined this board he brought to my attention that the wire/needle method can cause "nicking of the throttle plate which permanently ruins the plate and introduces unregulated air." And you know that he's seen the guts of enough of these carbs to know what he's talking about.

So, how to get a decent bench sync?

Simply look into and around the outlet port of #3 carb and locate the bypass outlet. It will be right along the line of the resting butterfly.

GL1100_carb_wm.jpg

Note the relationship of the outlet to the edge of the butterfly. Now, adjust the 1/3 sync screw so that #1's butterfly position matches #3.

Flip 'round to the other side and adjust #2 and #4 so they match each other. The 2/4 sync screw is between those two carbs.

Lastly, adjust the left bank's sync screw so the 2/4 set matches up to #3. The side-to-side sync screw is aft of #4 carb.

Thanks to Mike Nixon for the info and pic!
.
You do not have the required permissions to view the files attached to this post.

User avatar
zavikan
Silver Member
Silver Member
Posts: 668
Joined: Mon Nov 23, 2009 9:08 am

Re: Carb Sync

Post #2 by zavikan » Wed Aug 14, 2013 9:53 am

That's how I did mine. I am by no means an accomplished or talented mechanic like many on this board....but I just saw that as the obvious solution.

I wonder how many small nuggets of insight like that is unspoken from the minds of the average. Simply because we didn't think it was worth mentioning...

Good to have it out tho!
'76 Goldwing GL1000 33k
'77 Goldwing GL1000 53k SOLD

User avatar
CYBORG
Moderator
Moderator
Posts: 19945
Joined: Mon Jan 14, 2008 12:52 pm
Location: Muskegon mich

Re: Carb Sync

Post #3 by CYBORG » Wed Aug 14, 2013 10:00 am

all ideas and shortcuts, or home remedys are wroth mentioning. i learn something new almost every day on this site action1 action1
1978 custom GL1000
1977 custom with 1200 engine
1985 gl1200

User avatar
Irishman1
Billet Alum. Member
Billet Alum. Member
Posts: 246
Joined: Thu Oct 11, 2012 11:51 pm
Location: Washington

Re: Carb Bench Sync

Post #4 by Irishman1 » Fri Oct 24, 2014 2:10 am

After reading this I just looked at the 1100 Carbs on Ruth's build and they were all way off! Didn't think my carbs had the ports at first!! Thx :crosso
In the garage:


1975 Honda gl1000 sulfur yellow( my first!)
1975 Honda gl1000 red (Ruth's free bike)BOTM January 2017
1975 honda gl1000 red. Eariest of my 75's 2/75 date
1975 Honda gl1000 blue green 3/75
1976 Honda gl1000 sulfur yellow
1977 honda gl1000 red black, Ian's next bike
1976 Honda gl1000 red next restoration
1975 Honda cb750 rebuilding soon!
1975 Honda gl1000 2/75 blue/green
1978 Honda cb750f super sport
1981 Honda CBX
"I really need a BIGGER garage!!"
" ride'm, don't hide'm!!!


Return to “How To 4-Wings (Tutorials Only)”

Who is online

Users browsing this forum: No registered users and 1 guest