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

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 83 (permalink) Old 03-14-2014, 07:45 PM Thread Starter
Senior Member
 
jcryan1988's Avatar
 
Join Date: Jan 2013
Location: New England
Posts: 113
iTrader: (0)
 
carburetor mix screws

Hello how's it going? I have a 1999 Kawasaki Vulcan 750 with 3,000 miles on it. When I got it it wouldn't run correctly, before I found out the carbs were gummed up I messed with the adjustment screws and the black air screw. I brought it to a friend of mine that got the bike running good, but when I ride it around the yard and i come to an incline and stop and try to take off again the bike will stall out and when I roll it to flat ground and take off again it is fine. Could my lack of power starting off on an incline be because the screws aren't in the correct position? Not sure if it makes a difference or not but I am practicing in my back yard in the lawn. I want to make sure this bike is in tip top shape before I get it registered. I was told I should bring it to a shop to find out if the adjustment screws are in the correct position but money is pretty tight right now for me to be able to afford a shop. Is there a way to figure this stuff out myself? Thanks!
jcryan1988 is offline  
Sponsored Links
Advertisement
 
post #2 of 83 (permalink) Old 03-14-2014, 08:07 PM
..have a vulcan good day!
 
WilliamTech's Avatar
 
Join Date: May 2011
Location: Pensacola, FL.
Posts: 4,508
iTrader: (17)
   
Quote:
Originally Posted by jcryan1988 View Post
Hello how's it going? I have a 1999 Kawasaki Vulcan 750 with 3,000 miles on it. When I got it it wouldn't run correctly, before I found out the carbs were gummed up I messed with the adjustment screws and the black air screw. I brought it to a friend of mine that got the bike running good, but when I ride it around the yard and i come to an incline and stop and try to take off again the bike will stall out and when I roll it to flat ground and take off again it is fine. Could my lack of power starting off on an incline be because the screws aren't in the correct position? Not sure if it makes a difference or not but I am practicing in my back yard in the lawn. I want to make sure this bike is in tip top shape before I get it registered. I was told I should bring it to a shop to find out if the adjustment screws are in the correct position but money is pretty tight right now for me to be able to afford a shop. Is there a way to figure this stuff out myself? Thanks!
No need to pay a shop, many experts on the forum can/will inform (in detail) you how to do it yourself.

I am not one of them. Be patient for a day or two.


'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!
WilliamTech is offline  
post #3 of 83 (permalink) Old 03-14-2014, 08:14 PM
Crowley
 
crowley1027's Avatar
 
Join Date: Feb 2014
Location: Southern RI
Posts: 1,263
iTrader: (0)
 
You should go into the carbs section of this forum and view the sticky that labels the Carburetor parts.

The external adjustable parts are the idle adjuster and air/fuel mixture screw. You can easily identify these through the sticky I mentioned.

I suspect you fiddled with the idle adjuster, the black knob. That only adjusts idle, as far as I know... So start your bike, let it warm up (I think), make sure choke is off, and turn the back knob till idle is 1000 rpm.

The air mix screws may be your problem. Get a long thin screwdriver (I just picked a set up at harbor freight for 4 dollars. Again, refer to some diagram to show you where the adjust screws are located. They are at a strange angle... Turn them all the way in, and turn them out two and a half turns.

Sent from Motorcycle.com Free App
crowley1027 is offline  
 
post #4 of 83 (permalink) Old 03-14-2014, 08:15 PM
Crowley
 
crowley1027's Avatar
 
Join Date: Feb 2014
Location: Southern RI
Posts: 1,263
iTrader: (0)
 
I also suspect another problem. You aren't getting the power you need when it dies... It could be a bunch of problems.

Sent from Motorcycle.com Free App
crowley1027 is offline  
post #5 of 83 (permalink) Old 03-14-2014, 08:29 PM
..have a vulcan good day!
 
WilliamTech's Avatar
 
Join Date: May 2011
Location: Pensacola, FL.
Posts: 4,508
iTrader: (17)
   
Quote:
Originally Posted by Nadan8 View Post
You should go into the carbs section of this forum and view the sticky that labels the Carburetor parts.

The external adjustable parts are the idle adjuster and air/fuel mixture screw. You can easily identify these through the sticky I mentioned.

I suspect you fiddled with the idle adjuster, the black knob. That only adjusts idle, as far as I know... So start your bike, let it warm up (I think), make sure choke is off, and turn the back knob till idle is 1000 rpm.

The air mix screws may be your problem. Get a long thin screwdriver (I just picked a set up at harbor freight for 4 dollars. Again, refer to some diagram to show you where the adjust screws are located. They are at a strange angle... Turn them all the way in, and turn them out two and a half turns.

Sent from Motorcycle.com Free App

very correctly stated.


With engine not running, Adjust (fine tune) for highest idle...that'll get you VERY close.

Start engine, then fine tune if/as necessary.


Many notes in forum verses...& probly a sticky.




'86 VN750 13,700 mi -Stock
-Purchased 2008 w/8800mi
Replaced ALL Cables . Kuryakyn LED Voltmeter
SilverStar Ultra 9003/HB2 H4 Headlamp, Jardine Fwd Controls,
Iridiums DPR7EIX-9 & Wires, Tuxedo Mod, Coil Mod, P/U Sensor Mod, Fork Seals,
Splines Lubed - 11/4/2012 - MF AGM Battery
Additional Flashing LED Brake Light on Trunk
Dampers went out @ 13+K !
After TOC MCCT's..... so amazingly quiet I discovered a rattling heat shield on my stock exhaust !
...have a vulcan good day!

Last edited by WilliamTech; 03-14-2014 at 08:32 PM.
WilliamTech is offline  
post #6 of 83 (permalink) Old 03-14-2014, 08:31 PM
Crowley
 
crowley1027's Avatar
 
Join Date: Feb 2014
Location: Southern RI
Posts: 1,263
iTrader: (0)
 
I'd say clean the carbs... It's not fun, for me it was scary, but I did it and got it all back together and working....... Have a friend that knows what they are doing perform this.

Try to search for Wolfie's "carb blowback"

Sent from Motorcycle.com Free App
crowley1027 is offline  
post #7 of 83 (permalink) Old 03-14-2014, 08:39 PM
Crowley
 
crowley1027's Avatar
 
Join Date: Feb 2014
Location: Southern RI
Posts: 1,263
iTrader: (0)
 
Are you sure you aren't the problem? I don't want to sound offensive, but is it possible you aren't giving it enough gas or pulling the clutch out too fast?

Sent from Motorcycle.com Free App
crowley1027 is offline  
post #8 of 83 (permalink) Old 03-14-2014, 08:44 PM
Senior Member
 
Spockster's Avatar
 
Join Date: Nov 2012
Location: WV
Posts: 7,265
iTrader: (5)
   
The description makes me think it could be the sidestand switch.

2003-21k mi
Shaved w/UniPK92+Stock Jets-TPE/MOSFET-Shinko Tires-AGM batt-bags-chrome-LEDs...more
__________________________________________________ ____________
Repair Manual: http://www.mediafire.com/file/mj7z81..._Catalogue.pdf

Owner's Manual: http://www.mediafire.com/file/nscb5f...ers+Manual.pdf
Spockster is offline  
post #9 of 83 (permalink) Old 03-14-2014, 08:50 PM
Crowley
 
crowley1027's Avatar
 
Join Date: Feb 2014
Location: Southern RI
Posts: 1,263
iTrader: (0)
 
Good idea

Sent from Motorcycle.com Free App
crowley1027 is offline  
post #10 of 83 (permalink) Old 03-14-2014, 08:56 PM Thread Starter
Senior Member
 
jcryan1988's Avatar
 
Join Date: Jan 2013
Location: New England
Posts: 113
iTrader: (0)
 
It currently idles a little under 1,000 rpm. I fixed a buddies computer and in return he cleaned the carbs and bought a couple new parts for them when he cleaned them for me. I wish I left the adjustment screws alone and the idle adjuster alone when i got the bike and just waited for him but i was anxious to try to get it going and became a "google warrior" and found a forum NOTHING like this one where someone had the problems I was having and someone suggested messing with adjustments. I do know exactly where the screws on the carbs are and yes they are on an angle, I got the perfect screwdriver for them. I will go into the carbs section and read up like you said. Should I turn the screws all the way in and bring them out 2 and a half times first? Or should I start the bike and adjust the black air adjustment screw until it idles at 1,000 rpm first? Thanks a lot for your responses!
jcryan1988 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