Carb sync - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
Carbs and Fuel System
From the gas tank to the carbs
All fuel system discussion

LinkBack Thread Tools Display Modes
post #1 of 8 (permalink) Old 07-08-2013, 01:09 AM Thread Starter
Lionheart's Avatar
Join Date: Jun 2013
Location: Springfield, Tennessee
Posts: 49
iTrader: (0)
Carb sync

Can't find the thread on how to sync our carbs what's the best way and is there a way to re jet the carb without taking it off the bike
Lionheart is offline  
Sponsored Links
post #2 of 8 (permalink) Old 07-08-2013, 02:40 AM
Senior Member
Join Date: Feb 2010
Location: Pittsburgh, PA
Posts: 856
iTrader: (10)
Originally Posted by Lionheart View Post
Can't find the thread on how to sync our carbs what's the best way and is there a way to re jet the carb without taking it off the bike
Not sure about finding a thread on syncing the carbs. Though I know Members on here (Wolfie I Think) has chimed in a few times that as long as both butterfly valves are opening and shutting at the same time you should be good.

Of course, I'm pretty sure you gotta take the carbs off to do that.

as for rejetting with out getting taking the carbs off the bike. I do believe you can get the bottoms off to access the jets. I highly doubt you can get the top plates off if you have the stock surge box in place, so getting shims under the needles would not be n option there.

Even then, In my opinion, it would be easier to get the carbs off the bike then to wrestle with getting at the jets without full carb removal.

......I'd rather wake up in the middle of nowhere then in any city on earth.

*2014 VN900 Custom (16,200 miles and counting)
Ndr is offline  
post #3 of 8 (permalink) Old 07-08-2013, 11:58 AM
Senior Member
Okiebezer's Avatar
Join Date: Apr 2012
Location: OKC
Posts: 1,020
iTrader: (2)
Here's a short video showing carb sync using a home made meter.

I have read threads where people say they have rejetted with carbs on, but I also agree that it would be very difficult to see and manuever in such a confined space. I did mine when I removed the carbs for proper cleaning.

Malibu Shades windscreen, headlight visor, custom dashboard with voltmeter and clock, luggage rack, extended backrest, Viking saddlebags and toolbag, Wingerline engine guard with foot pads, light bar with halogen bulbs, Hardley Sportster muffs with crossover, homemade coasters, earshave with K&N pods, 142/42 jets with 2 shims each needle, MCCT's, AGM battery, coil relay mod, Iridiums with yellow NGK plug wires, relocated R/R, WOLO air horn, chrome radiator guard
Okiebezer is offline  
post #4 of 8 (permalink) Old 07-08-2013, 01:17 PM
Join Date: Jan 2013
Posts: 2,190
iTrader: (0)
Lion, what leads you to desire a re-jet? Changed the exhaust?
wmsonta is offline  
post #5 of 8 (permalink) Old 07-19-2013, 03:52 PM
Join Date: Jan 2013
Posts: 2,190
iTrader: (0)
Rather than start a thread, I will add to this one. If this is not proper, somebody set me straight.

Synchronized the carb's on the City Girl yesterday. Did not think it necessary, rather I thought it probably needed carb work. Wrong.

Just less than $5, and less than 5 minutes, I had my tool made. The front cylinder was pulling hard. A different bike in the pilot circuit. A buddy was here and I took it to 5k on the center stand. Weird-ed him out a little.

We went for a short ride. It heats up quicker. Starts better, if that's possible. Cruises at less throttle. Puts much better, probably needs idle screws in a little. May need throttle cables re-adjusted.

The City Girl has new tires, splines checked, headlight is finally right and newly detailed. Time to ride, while looking for a reserve lighting unit. What do you kids say----

wmsonta is offline  
post #6 of 8 (permalink) Old 07-20-2013, 06:35 AM
Senior Member
Deviate's Avatar
Join Date: May 2012
Location: St. Augustine, Florida
Posts: 1,253
iTrader: (5)
Which tool did you make? The one with clear tube and a yard stick or the one with 2 bottles and clear tube? And what fluid did you use? I made the one with the tube and a yard stick and used ATF and I found that the fluid wasn't really thick enough. It moved a lot and made it really hard to get an accurate measure. I was thinking of maybe trying some gear oil that I use in the rear differential of my truck to see if it would be better.

Originally Posted by LibertyPilot View Post
Leave it to me to NOT be fond of something then end up banging it.
Deviate is offline  
post #7 of 8 (permalink) Old 07-20-2013, 07:31 AM
Senior Member
shark88's Avatar
Join Date: Jan 2008
Location: Central, PA
Posts: 2,500
iTrader: (27)
I had used the yard stick method when I did mine and filled the tubes with Seafoam. Wasn't that hard once you figured out where to hook up. I believe you needed a 7mm open end wrench to get into where the adjustment was. It was a few years ago, can't remember if there was a problem or I just did it for peace of mind because of everyone talking about it.

"Show me a man who makes no mistakes, and I'll show you a man who doesn't do things." Theodore Roosevelt."

2007 Victory Kingpin
Current projects - 1986 VN750 & 1988 EL250
shark88 is offline  
post #8 of 8 (permalink) Old 07-20-2013, 10:12 AM
Join Date: Jan 2013
Posts: 2,190
iTrader: (0)
Clear $.29 a ft hose and a yardstick. I cut two 6" pieces of rubber hose to go on the carbs. Used two mityvac ends to go into the 6 " hoses. The mityvac ends were probably 1/16" orifices. I used green rubbing alcohol and it was a good thing. The alcohol went into the front cylinder shortly after starting.

Huge difference in the pilot circuit, no discernible difference WFO. W/O a doubt, I will take the idle screws in a little.
wmsonta is offline  
Sponsored Links


Quick Reply

Register Now

In order to be able to post messages on the Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

Once registered, your User Name"cannot be changed". We can make exceptions within 7 days, but after that, it is set in stone.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome