Yamaha 650  97-11 
V Star / Drag Star / Drag Star Classic
(Factory Pro "Y90" Series)

True Rear Wheel HP Scale
as measured on the EC997 Low Inertia Eddy Current Dynamometer

Carb Kits

use with the stock airbox

International buyers will be billed an additional  $18 for shipping

STD drop-in carb recal kit

Best "drop-in" kit available. Boosts power a bit at full throttle, improves throttle response when properly tuned. Definitely pulls harder out of 2nd and 3rd gear corners.
This kit includes: our custom Celmat30 needles, a package of clips (with extras), a selection of Mikuni or Factory Pro M Type main jets for dialing in most types of exhaust systems. No slide drilling is required!
Note: If using large diameter, non baffled exhaust systems, it is usual to use 1 to 2 sizes larger than stock pilot jets. We can supply these at additional expense if requested.
Allen Screws: 


use with aftermarket airbox or pod filters



all till 2011

dyno__stk_to_Micron_SO_K88-1.7-RK_4deg_adv.gif (19824 bytes)
 Our Big Air Kit vs.  stock carb and airbox

We designed the kit and even coined the name "Big Air Kit"

For the V Star in 1998 - maybe before anybody else had even entertained a thought of removing a cruiser's airbox for more power! It seems that the name has become the favorite term of some others! Go figure!
We took our years of experience in tuning non-airboxed bikes, worked through many setups - testing on the high quality Low Inertia EC997 Eddy Current . This allowed us to make many small .1hp and .2hp changes that eventually added up to a massive 10% to 12% power increase between 3k and 5k and a healthy 8% to 10% increase to peak True HP numbers. All that with absolutely no loss of low-end and cruise power. No slide drilling is required.
Mileage, when properly tuned, doesn't seem to suffer appreciably, according to feedback from customers.
Full Big Air Kit includes: individual K&N or BMC washable air filters and a custom, matching Factory Pro Carb Recal Kit (item contents similar in quantity to the above 1.0 kit) for jetting ease. 
Note: If using large diameter, non baffled exhaust systems, it is usual to use larger than stock pilot jets. We can supply these at additional expense if requested.


International buyers will be billed $22 for shipping

General Technical Support





Absolutely NO carb parts sold in California.

New and improved Suzuki Teka SFI  2

with new TPS display and "MMT" Memory Module Tuner

Finally - Quick, easy, cost effective Suzuki tuning with no expensive "add-on boxes"
Suzuki cruisers and sportbikes

Please click here for more info

Contact Factory Pro
M-F, 9am - 5pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here


Mailing / Shipping address:

Factory Pro
101c Roblar Drive
Novato, CA

And most importantly
Restart back at the HOME page and click on the red box in the top left to find the bike that you want parts for...
restart at HOME page


This Tuning Site has been visited by
www.digits.net - the oldest counting service on the web





EFI and Carb Tuning - Most all FI and carb tuning

by Wheelsmith Racing

Flight Training - train with AMA race winner Todd Harrington.

The Harringtons own American Flyers, one of the most established flight training facilities in the USA.

 8 locations

The Rich Oliver Mystery School will help you discover your hidden inner strength. 
It will challenge you. It will teach you a new way of thinking, and a new way of riding. You can take your riding to an exciting new level!  

We use a variety of proven drills and training techniques. 
Practicing these techniques with our Yamaha dirt track trainers will enhance your abilities both on the track or the street.  

It doesn't matter what you ride or race, the Rich Oliver Mystery School improves everyone's skill level and mindset!

WW2 vintage flying Special

Book a sightseeing flight over the Wine Country or a Kamikaze aerobatic flight or a biplane flight over famous Sonoma Raceway, the Golden Gate Bridge and the San Francisco Bay for one or two during the spring and get a free souvenir t shirt!
(NEW!  Ask about the P-40 flights!)

707 938 2444

Just tell them that you saw this on the Factory Pro website!
Northern California's most unforgettable flying experience.  No experience required.  Open weekends!

The extension of the laboratory for engines of the Swiss Federal Institute of Technology was completed in about 1935. Its architect was Rudolf Otto Salvisberg (1882-1940). He had a successful career in Berlin but returned to Switzerland after the advent of the Nazis. His architectural style was somewhat similar to that of Erich Mendelsohn. The staircase of the laboratory is in normal use but well preserved.
Edited to the tunes of Chemical Residue by Herbie Hancock.