I think that is the Cologne Trade Show, years ago There was an R7 next to it.

YZF600r Thunder Cat
from 97, till at least 07


Item Description

(sample pic above)

(actual 97 yzf600r "Thunder Cat" carbs)

Long Boy Fuel Screw Kit
for 97-07 yzf600r Euro and USA

pn: CRZ-SCR-3020m1-K4JH
replaces 4JH-14105-00-00

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

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Finger AND Screwdriver adjustable extended Fuel Screws

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 o-rings, 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".

Extended screw assembly comes with:
4 Long Boy fuel screws 
 4 new o-rings
4 new washers
4 new springs


The BEST CARB KIT description

CRB-Y71-1.7-RK   $199.95

Adds 2-3hp over a regular jet kit.
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"1.7 RaceKit" carb kit

Slightly more complex to install than our "drop-in" kit.  No slide drilling.
Use with stock or aftermarket exhaust.

First choice in carb kits for this bike.

Makes best power, overall. Period. Was used by every Pro AMA and EVERY WERA roadracer at the GNF.
Absolutely the best performing kit for on and off track use. When properly tuned, this kit produces the best low-end and midrange possible - and adds 2-3hp to the top-end power.
This is the ONLY kit to use for best power.
Imagine! You can still buy the trickest parts that were ever used!!!

CRB-Y71-1.1-TI   $159.95

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Ti Pro Kit carb kit

Drop-in Kit. No slide drilling.
Titanium needles. The toughest material used in a carburetor. These needles will still be around in the millennium after next.
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-Y71-1.0   $139.95

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Drop-in Kit. No slide drilling.
Our own Celmat30 needle material. The most durable material, aside from Ti, used in a carburetor. 
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.

RTR-YAM-1    $89.95

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Ignition Advance Kit

This IS the kit that every top WERA / AMA racer used.

Adds more lowend, midrange and topend - and pulls better off corners - better trackday and in-town bike.

Let me say this:
There is no Ignition Advancer kit specifically for this bike.

ALTHOUGH - this RTR-YAM-1 kit contains the magic offset flywheel key that will advance the ignition timing 5 degrees.
The kit DOES NOT contain the flywheel puller that is required to remove the stock alternator flywheel A Yamaha dealership would have the 3 arm puller. And probably most shops will have a 3 bolt puller.

(sample pic)

SHFT-PRO-YAM-1   $139.95

(add $20 for ceramic bearing)

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Make shifting MUCH quicker and virtually eliminate missed shifts. This is exactly the same kit that Yamaha Racing used. Huge shift action improvement. 

Trans Detent Arm Kit

The kit requires the removal of a 27mm clutch nut - so, you'll need a:
Deep 27mm socket and an Air or electric impact wrench
If you insist on not having an impact wrench, you'll need and appreciate....... A friend to hold the rear brake on while you loosen the 27mm nut while the bike is in 3rd (ish) gear.....

User's comments




Billet Engine Cover

RH Cover for the yzf600, complete with steel "Skidz" cover insert. Absolutely the strongest cover you can buy - and has the highest strength / weight ratio available! Individual replacement cover available direct from Factory.


I'm out of the little Steel inserts and won't be making more -
I'll sell the cover, with stainless steel screws and gasket - but without the steel insert for
only $120.


DISCONTINUED - only have outer cover - $40

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Call 800 869-0497  or email

True Rear Wheel Horsepower tm   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


This Tuning Site has been visited by
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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.