Honda CBR400RR, NC23

Carburetor Recal and air filter Kit

 Need bike to test

Improve your shifting  with a Shift STAR kit

for 87-89 NC23
w/o clutch cover gasket
(thanks Mike Dabek for the NC23 research)

1. Choose your shipping method

Complete Evo Shift Star kit

Note - must decrease shift kill duration 5-10ms - it's 5-10ms quicker.

Make shifting MUCH quicker and virtually eliminate missed shifts. Helps address missed shifts caused by poor shift detent "star" profile. MUCH more consistent shifting.
Helps prevent damage caused by missed shifts.
Not at liberty to disclose WHO used this kit on their F4's.........

User's comments

Install directions page

stock pn reference

Shift detent arm

Shift detent spring

Shift drum shift star
Superseded by (24312ky-310)

Gasket number
superseded by (11396my9000).


for the NC23

Adding the EVO Shift STAR kit makes shifting so sweet that you'll want to ride just so you can slip the bike into each gear with silky precision. The Marc Salvisberg designed Shift STAR has optimized compound arcs, peak heights and valley depths that almost do the impossible - it's easier to get out of gear and shifts quicker into the next gear -
The normal, original lag in shift completion rate is what makes the transmission feel "clunky" around town.

Make shifting MUCH quicker and virtually eliminate missed shifts. Helps address missed shifts caused by poor shift detent "star" profile.

The kit includes the new Factory Pro Shift STAR and the Factory Pro detent arm and spring, as described below.

User's comments



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
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.