80-83 (perhaps EZ also)
Factory Pro Series "S16"

The Carb Recal Kit perk up the low-end and midrange power and response for quicker warm-up and more response.

The Transmission Detent Spring Kit really puts "snick" into the shifting brightening up the shifting on the venerable soldier!


CRB-S16-1.0  $139.95

1. Choose your shipping method


Standard drop-in carb kit

The kit, when properly tuned, adds more low-end / midrange and if the proper main jet is selected, more top-end power. Easy to install and tune - no slide drilling!

CRB-S16-1.1-TI  $159.95
special mfg.

1. Choose your shipping method


Ti ProKit carb kit

Titanium needles. The toughest material used in a carburetor. These needles will still be around in the millennium after next. Keihin, unlike Mikuni, uses a steel needle jet. Ti and steel, in this application are unbeatable for long life.
The kit, when properly tuned, adds more low-end / midrange and if the proper main jet is selected, more top-end power. Easy to install and tune - no slide drilling!


CRB-S16-3.0  $139.95
(w/o filters)

1. Choose your shipping method


Config 30 carb kit

Requires removal of stock airbox and running BMC or equivalent K&N individual air filters. Otherwise, it is a drop-in kit. Low-end response is as good as, if not better than stock carb tuning.
Extended Fuel screws for easy(ier) adjustment

It's a sample pic - the fuel screws are on the top of the carbs.

"Long Boy"

Finger and screwdriver adj. extended Fuel Screw Kit

Frustrated with trying to find an "almost 90 degree"  screwdriver to fine adjust your fuel screws for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screws to adjust fuel screws for best throttle response. Traveling to high altitude? It's easy to lean out the lowend temporarily.

Make your life easier!

Remove old short stock fuel screws, old orings, old washers and old spring. The o-ring might be stuck in the carb, so, take a light and make sure it's really out if it didn't come out with the screw (or you can't find it after you took out the screw)
Use a small bent wire to pull it out if it doesn't drop out. Keep the old parts for "spares".

Fuel screw kit comes with:
4 Long Boy fuel screws
 4 new o-ring
4 new washer
4 new spring

Long Boy Fuel Screw set
pn: CRZ-SCR-SUZ-5020ms16
single taper tip profile


 with 4 new screws, springs, washers and o-rings

1. Choose your shipping method



There are 2 undocumented fuel screw types

If your original screw looks like this,
with a single tip taper, get the "5020ms16" to the left.





If the GSX1100g experiences excessive low-end richness that cannot be compensated for by lowering the fuel level by setting the floats any greater than 16.5mm, the needle jets (the needle hole in the top of the emulsion tube) is probably worn excessively and must be replaced to lean the low-end. See Emulsion Tubes, worn


TL-float height gauge  $59.95

The only way to accurately measure float heights. Works on nearly every carburetor.

True Rear Wheel Horsepower® Factory EC997a Eddy Current Dynamometer



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


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people. - 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.