ZX600 and ZX400
1985-1987 only

Includes ZL600 and ZX600 Ninja models AND GPZ 400 R (ZX 400 D/D3/D3A) 85-87

and the

 ZL600 Eliminator


Long Boy Extended Fuel Screw
pn: CRZ-SCR-3518k2
 with 4 new springs, washers and o-rings

1. Choose your shipping method

"Long Boy"
 Finger adjustable and screwdriver extended Fuel Screw assembly

Frustrated with trying to find an "almost 90 degree"  screwdriver to fine adjust your fuel screw for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screw to adjust fuel screw 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 screw, old o-ring, old washer and old spring. The o-ring might be stuck in the carb, so take a light and make sure it's really out  (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".

Screw assembly kit comes with:
4  Long Boy fuel screw  CRZ-SCR-3518k2
4  new o-ring
4 new washer
4 new spring


F-Pro Shift Spring  -  Shift quicker and virtually eliminate missed shifts

The Blue Shift Spring

$16 + shipping
(yes, in good humor, it's $14 for UPS Ground, even for a little blue spring - and we have to ship it tracked and insured and no I can't just drop it in the mail and hope and wish you get it and no, I can't send someone down to the post office to mail it Priority tracked and insured)

or you could pretend it's:

$30 and Free UPS ground shipping!
1. Choose your shipping method



From Factory Pro - the originator of motorcycle shift kits.

Blue Shift Spring

600 Ninja guys have been asking when we would make a 600 Shift Spring.

We did.

Improve lazy shifting - virtually eliminate missed shifts - virtually eliminate false neutrals -  help prevent gearbox damage caused by missed shifts.
Not a quickshifter, this spring makes the stock shift mechanism shift quicker by 3ms to 7ms per shift.

Countless hours of thought went into this spring's specs.

JUST right = MAGIC shifting.

Positive feedback rating

This kit includes the new F-Pro Shift Spring.
That's it. A carefully fabricated and heat treated spring.

1-2 minutes to install.

1. Remove bolt and old spring.
2. Replace old spring with New Blue Shift Spring.
3. Replace bolt.
4. Shift better and find neutral easier.

Factory Pro Carb Jetting Kits


also GPZ 400 R (ZX 400 D/D3/D3A) 85-87

for if running the stock airbox

buy carb kit only $149.95
International buyers will be billed $36 additional for USPS Global Express shipping

Carb jetting Kit  for stock airbox
You can use a stock or aftermarket stock replacement air filter.

800 869-0497
(m-f 9-5 pac time)

standard drop-in kit, no drilling
Celmat30 needles

Carb Recalibration Kit tm

CRB-K02-3.0   $139.95

for pod filters

buy carb kit only $149.95
International buyers will be billed $36 additional for USPS Global Express shipping

CRB-K02-3.0 AND 4 air filters  $259.90

buy carb kit AND 4 Air Filters $249.95
Save $9.90
International buyers will be billed $36 additional for USPS Global Express shipping


Drop-in kit, no slide drilling - for individual
air filters
Celmat30 needles

This is the kit that you use to jet the carbs when you take off the airbox and run 4 individual air filters.

Ignition Advancer

RTR-KAW-1  $99.95 USD

International buyers will be billed $36 additional for USPS Global Express shipping

More part throttle power, better mileage - improves mountain and 2-up riding. Mild +4.
Works well with street pump fuel. Does not require "race gas".

Takes about 30 minutes to install with only hand tools.

Kawasaki 600 Notes:
There is a heck of a lot of Kawasaki 600 models and it's not uncommon to buy ignition advancers for the wrong model Kaw 600.
One good thing is that all the rotors definitely look different.
Your new ignition rotor should almost identical to the one you are replacing - as far as size and number of "points". If it's visibly different in size or number of "points", then look at your VIN plate and it will tell you which model you have. In this case, you can read "ZX600C" right on the VIN plate.
Don't try to install the wrong rotor.

Float Height setting tool


International buyers will be billed $18 additional for USPS Global Express shipping
The easiest way to set float height - important when tuning for max mileage.


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.