Carb adjustments for higher altitudes? - 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 05-09-2007, 11:02 AM Thread Starter
Drive less, ride more...
theauhawk's Avatar
Join Date: Nov 2005
Location: SW Ga
Posts: 1,114
iTrader: (0)
Question Carb adjustments for higher altitudes?

What adjustments are there (if any) to our bike's carbs while out touring, to compensate for potential high-elevation (i.e., 4,000+ feet over sea level) fuel/air mixture issues?

In thinking ahead, I gather that the bike would start to run a richer mixture and lose power, as the elevations increase.

I've looked thru the Clymer manual and the owner's manual, and I don't see any.

I'm talking relatively simple adjustments here, that can be made (and then undone) in the field while out on a trip. I realize that turbocharging and computerized fuel injection are the answers to this, in a perfect world.

My bike's fuel/exhaust system is completely stock (and it's an '05 model).

Any suggestions on this, anyone??....
theauhawk is offline  
Sponsored Links
post #2 of 5 (permalink) Old 05-09-2007, 01:32 PM
Mushu's Avatar
Join Date: Mar 2006
Location: Mexico City
Posts: 90
iTrader: (0)
Send a message via MSN to Mushu
I live in Mexico city at 7,300 ft over sea level and I have stock settings on the carburetors and have very little issues with hesitation or other fuel related problems (only at full gas does my bike hesitates) . Our bikes run a bit lean at sea level so it should be ok at higher altitudes.
One thing to keep in mind is that at higher altitude all motors losses some power because of thin air but 10% or 15% loss of power shouldn't be an issue.

93 VN750
R/R Relocation to the front
Pirelli MT66 Tires soon to be mounted (only after 14 years...)
Mushu is offline  
post #3 of 5 (permalink) Old 05-09-2007, 02:31 PM
Members who have donated towards server costs
Join Date: Jan 2006
Location: Cheyenne Wyoming
Posts: 508
iTrader: (0)
Cheyenne Wy. @6400 ft and all works well. Have ridden to 10000 with no problems. Pipes do get some carbon but that is normal at this altitude. Gas milage varies from 45-55 mpg depending on how hard I ride and whether or not I am buckin the wind.

Dennis Huff
Cheyenne, Wy.
05 VN 750
KURYAKYN grips, helmet locks, and highway pegs
Spitfire windshield
Saddleman saddlebags/sissybar bag
Highwayman gelseat with Protac backrest
self canx turnsignals
Diamondstar headlight modulator
Jardine 2 into 2
MCC turn signal relocator and floorboards
Luggage rack
Extended passenger backrest
KURYAKYN LED voltmeter
Custom tank bra with analog clock
Snider paint protector on tank side
130 DB horns
rckmtn is offline  
post #4 of 5 (permalink) Old 05-09-2007, 04:59 PM
Join Date: Apr 2007
Posts: 26
iTrader: (0)
I'm live in Colorado and have been riding at 4,000-8,000ft, stock, with no problems.
asaracho is offline  
post #5 of 5 (permalink) Old 05-09-2007, 05:53 PM Thread Starter
Drive less, ride more...
theauhawk's Avatar
Join Date: Nov 2005
Location: SW Ga
Posts: 1,114
iTrader: (0)
It appears from your answers that I am reading in between the lines a little bit too hard, looking for a problem that apparently just isn't there.

What got me to thinking about this was a girl I met last week. She was riding an '87 model Honda Magna (one of those with the curved pipes)--another carbureted bike from the 80s. In the conversation she mentioned stumbling, hesitation, and loss of power at altitude while riding near the Blue Ridge Pkwy. But her bike sounded ok while she rode away in front of me.

In any case, thanks for the excellent feedback!!!...
theauhawk 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