Carb Sync Question - 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 5 (permalink) Old 03-29-2008, 12:18 AM Thread Starter
Vulcan Bobber
 
aminjuez's Avatar
 
Join Date: Nov 2007
Posts: 82
iTrader: (0)
 
Question Carb Sync Question

Today I sync the carbs using the yardstick tool, well at idle like the clymers manual say,Ok did it, but when I increase the throttle at 3000 or more rpm the rear cylinder mark more vacuum in the tool, anyway I ran the bike to see the effect of synchronisation at idle rpm but on the road the bike loose power.....soooo is it normal the diferent between front and rear cylinder at high rpm's?

1989 Vulcan 750
Bobber style.
33000 miles,
aminjuez is offline  
Sponsored Links
Advertisement
 
post #2 of 5 (permalink) Old 03-29-2008, 12:29 AM
85 VN 700
 
curtis97322's Avatar
 
Join Date: Feb 2007
Location: Albany, OR
Posts: 1,033
iTrader: (4)
 
yup. It's normal.

Curtis - Albany Oregon.
Currently receiving therapy from "Doc" - My 1985 VN700.

Daily rider in NorthWET Oregon.
Ammo Can Saddlebags
Shaved and Rejetted. Coastered. Degoated w/ Hardley pipes.

Bought Feb 2007 with 12K miles.
Hit the 24k mile July 2008

http://photobucket.com/curtis97322
curtis97322 is offline  
post #3 of 5 (permalink) Old 03-29-2008, 06:19 PM
Members who have donated towards server costs
 
Sky Rider's Avatar
 
Join Date: Jun 2006
Location: Corpus Christi, Texas
Posts: 1,647
iTrader: (0)
 
You will never get the carbs synced at all RPMs. If they are synced at idle, they will be out of sync at higher RPM. If you sync them at higher RPM, they will be out at idle. It's due to the differences in compression between the cylinders as well as other tolerances throughout the engine that make it impossible to sync them for the entire range of engine RPM.

Jim W
93 VN 750 "Ursula"
Moved R/R 08Sep06
R/R rewire 17Feb07
New R/R, Installed 14Jun08
New Stator installed 10 Jun08
Maintenance Free Battery 12Jan08
21480 Miles
VROC #8542
Sky Rider is offline  
 
post #4 of 5 (permalink) Old 03-29-2008, 07:31 PM
85 VN 700
 
curtis97322's Avatar
 
Join Date: Feb 2007
Location: Albany, OR
Posts: 1,033
iTrader: (4)
 
And also consider that what comes out as a couple inches with the yardstick tool would be barely noticeable with a mercury manometer.... we're comparing something 13.6 times lighter than water vs something roughly .8 times the density of water. So something that would be 1mm with mercury would be 1.7 cm (about 5/8 inch). Most people wouldn't care about 1/2 a cm (1/4 in) difference with mercury sticks - but that's a bit over 3 1/4 inches with the oil sticks....

Gosh I hate flipping between english and metric... wish we'd just go to metric....

Get my point?

Curtis - Albany Oregon.
Currently receiving therapy from "Doc" - My 1985 VN700.

Daily rider in NorthWET Oregon.
Ammo Can Saddlebags
Shaved and Rejetted. Coastered. Degoated w/ Hardley pipes.

Bought Feb 2007 with 12K miles.
Hit the 24k mile July 2008

http://photobucket.com/curtis97322
curtis97322 is offline  
post #5 of 5 (permalink) Old 03-31-2008, 02:42 PM Thread Starter
Vulcan Bobber
 
aminjuez's Avatar
 
Join Date: Nov 2007
Posts: 82
iTrader: (0)
 
you rock my world

1989 Vulcan 750
Bobber style.
33000 miles,
aminjuez is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

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

Password:


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

Email Address:
OR

Log-in










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