CV Carb Tuning
copyright 2013
Have a website? Want to provide tuning information?
Please do not plagiarize this page - it took years to develop and write and is not based on any other previous work by anybody else. If you want to link to this page on your site, please ask - we are perfectly willing to allow links as long as proper credit is provided. Thank you in advance - Marc Salvisberg

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Low rpm engines qqq qqq qqq qqq qqq qqq qqq
High rpm engine qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq qqq

Low RPM engines
with redlines of 7000 rpm and lower
Click here!
High RPM engines
bikes with redlines of 8000 rpm and higher
Click here

Important notes about CV carb tuning!

To properly tune, you MUST:

1. Have selected the BEST main jet for full throttle power (not just a "good" main jet - we mean "the BEST main jet" for power at high rpm).
    That eliminates the common severe tweaking of the midrange and lower tuning ranges to compensate for a "wrong" main jet.

2. Then - select the BEST needle height / clip position for power at FULL THROTTLE / MIDRANGE after selecting the BEST main jet -
    That almost eliminates weird problems at cruise caused by tweaked needle heights that were required because the main jet wasn't correct.......

3. Then, adjust the BEST Float Height for BEST FULL THROTTLE / LOW rpm (many Honda's excluded because floats are not adjustable) -
    You should be able to apply FULL THROTTLE at LOW RPM in TOP gear without ANY misfire of bogging or stumble.......

If you follow that order, you will have:
    1. Best topend.
    2. Best midrange.
    3. Best low rpm power.

Then - all you have left is dialing in the pilot circuit - i.e. mixture screw and pilot jet size - That's IT - Don't tweak needle heights and throw away full throttle midrange to try to fix a cruise issue!!! (Unless you want to!)

If you reach an impasse in steps 1,2 and 3 in the FULL THROTTLE tuning, STOP!!!!! and call TECH SUPPORT!!!

415 883-5620
and 800 869-0497, ask for TECH SUPPORT -



" If your not sure which main jet is correct, use the one that is for sure not incorrect"

 Your Truly

Koto "the chore boy"

Authorized links
to Factory Pro CV Carb Tuning Instructions
click here to request authorization

Motorcycle Websites
Maxair Engineering - Cruiser Performance accessories added Feb 25, 2004  Honda Sportbike Network -
Randy Sinisi / Semoff Bros. Ultimate guide!   added July 9, 2004
Suzuki - The Flying Banana - Katana 1100 The Lonesome Twin UK added Feb 10, 2005
Sport-touring . net added July 20, 2002 added Sept 7, 2005
Suzuki: Mika's 650 Savage - in Finnish added June 4, 2003 added Feb 23, 2006
Triumph: Thunderbird Sportriders Group  added March 18, 2003 Ruckus Scooters - added November 3, 2007 Welcome to BikeCliff's Website - GS series Suzukis added March 23, 2010

Vulcan Riders and Owners Club, Manitoba added Feb 10, 2005   XS1100 Forum - dedicated to the first bike with a rev limiter - added April 9, 2010
Triumph: Thunderbird SportRiders . net - Gary's site   added March 18, 2003  
Yamaha: Larry's FZR Site  - added April 30, 200  
Yamaha: Martin Harvey's VMax Site -
added April 2, 2003
Yamaha: V-Max. org  added April 27, 2003  
Automotive Websites added June 13, 2003

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