Fuel to Air Ratio - 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 6 (permalink) Old 07-20-2015, 08:00 PM Thread Starter
Senior Member
 
Join Date: Feb 2014
Location: Clearwater, Fl
Posts: 102
iTrader: (0)
 
Fuel to Air Ratio

How far can I back out the 2 carb ratio screws? I did the rejet a while back according to the ear shave sticky. 142/42

Now that i've finally got my bike running consistently i need to tune it.
It smells like it's running very rich. I currently have it at front cyl 3 turns. rear 3 1/2 turns.

I don't get popping on decel. I originally had it at front 2 1/2, rear 3 but it smelled so rich i figured i needed more air.

I get a little hesitation (very little) going from a stop.

Occasionally when coming to a light and in neutral it will stay at ~2k-3k rpms a bit before dropping to 1.5k other times it will drop immediately to 1.5k This was more prominent at the previous fuel/air ratio.

Am i properly negating a fuel rich situation or is there a better way? I don't want to back out these screws too far.

OH...almost forgot. Stock exhaust.

Mike

2006 Vulcan 750
Ear Shaved
Re-jetted
ACCT --> MCCT Conversion
TW200 Petcock
www.michaelcmichaeldo.com
mcharles13 is offline  
Sponsored Links
Advertisement
 
post #2 of 6 (permalink) Old 07-20-2015, 08:01 PM
1986 VN750
 
thtanner's Avatar
 
Join Date: Nov 2011
Location: Dana Point, CA
Posts: 3,255
iTrader: (8)
 
Garage
If your RPMs are slow to drop, check the carb boots. They may not be seated all the way.

I run 3 1/2 turns for front, 3 for rear with V&H Cruzers. You may not need to back yours out as far with stock pipes. Some also may argue a re-jet was not needed without changing your pipes. That one is a bit up in the air, but you may indeed have too large of jets for your exhaust.

1986 Kawasaki Vulcan 750
NGK Iridium Plugs #7803/DPR7EIX-9
Duralast Gold ETX15 AGM Battery
Coastered & Shaved
TOC MCCTs
Metzeler ME880 [110/90-19, 170/80-15]
Balance Dampers Replaced
Tuxedo Mod
Rebuilt Forks w/ Progressive Springs
V&H Cruzers
VN750.com Grill Cover
Meanstreak Seat
Emgo 23-92411 Handlebars
MOSFET FH012AA R/R


1990 Kawasaki Vulcan 750

1998 Honda VFR800 FI

2014 Honda VFR800F

1989 Pontiac Firebird Formula 350
thtanner is offline  
post #3 of 6 (permalink) Old 07-20-2015, 08:41 PM
Crowley
 
crowley1027's Avatar
 
Join Date: Feb 2014
Location: Southern RI
Posts: 1,263
iTrader: (0)
 
Turning the adjustment screw out introduces more fuel. Clockwise for less fuel.

Sounds like you had it rich, and turned them out.

Try 2.5 in front, 2.5 in back, and screw in the front one if it is still too rich.
crowley1027 is offline  
 
post #4 of 6 (permalink) Old 07-20-2015, 09:04 PM
Super Moderator
 
Join Date: Feb 2013
Location: SW Florida
Posts: 2,527
iTrader: (5)
 
stock exhaust... many people have had good luck with stock jetting and just an ear shave

2005 VN750

Sold 11-27-17
michiganteddybear is offline  
post #5 of 6 (permalink) Old 07-21-2015, 07:51 AM
2014 KLR 650!
 
Goofyfoot2001's Avatar
 
Join Date: Jun 2013
Location: Tega Cay, SC
Posts: 3,361
iTrader: (1)
 
What crowley said, you're enriching.

2014 Kawasaki KLR 650
Back to the Kawa World
Goofyfoot2001 is offline  
post #6 of 6 (permalink) Old 07-21-2015, 11:26 AM Thread Starter
Senior Member
 
Join Date: Feb 2014
Location: Clearwater, Fl
Posts: 102
iTrader: (0)
 
DOH!

I thought backing the screw out was leaning it out. I'll reverse it and try.

Mike

2006 Vulcan 750
Ear Shaved
Re-jetted
ACCT --> MCCT Conversion
TW200 Petcock
www.michaelcmichaeldo.com
mcharles13 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