(sample pic, not actual star)

SHFT-STAR-Y45 (star only)  $139.95

(inc 1 EVO STAR only and gaskets not supplied)

(rpl 4EW-18185-00-00)
1. Choose your shipping method
yz250 91-23


The Factory Pro EVO Shift STAR Upgrade kit will upgrade your bike to "better than new" quicker, more consistent shift action.

Proven in 15+ years of pro level use.

Virtually eliminate missed shifts.

Decreases shift process 5mm to 10ms
Make shifting MUCH q
uicker and virtually eliminate missed shifts.

Helps address missed shifts caused by poor shift detent "star" profile.
Helps prevent shift fork and gear engagement dog damage caused by missed shifts.

The Factory Pro Shift STAR kit is an awesome upgrade for the notchy shifting.

Installation: Slightly more complicated than replacing the clutch basket. It's right behind the clutch basket.

No case splitting required.


Shift Star kit worked awesome!  Not one missed shift all weekend.  Easier to find neutral, too - Which is good because I have to put it in neutral to start it for some reason. Doesn't like to start with the clutch in. With the close ratio tranny, I did a lot of shifting.

Leigh Thomas - Mojave area


Hybrid Ceramic Microbearing
 Shift Detent Arm    $79.95

replaces original 14mm
#5CU-18140-01-00  shift arm

1. Choose your shipping method

The stock bearing on the yz250 is a bit fragile with steel balls, steel retainers, steel shields.

The F-Pro Hybrid Ceramic bearing has ceramic balls, digestible plastic retainers and rubber seals.






Yamahas yz250f and yzf450f Shift STAR Installation

Remove the clutch cover. Remove the clutch assembly
(use your shop manual)
Remove the little top hat collar and don't lose it.  
Pinch the pawls together and gently remove the pawl holder. Hold around the outside so the pawls, springs and plungers stay together.  
Turn the star till it reaches the stop (it's either 6th or 1st gear). Turn the clutch shaft to get it to go into the "next" gear.

Unscrew the center stud - it takes a deep 12mm socket.


Use a 10mm socket and remove the 6mm pivot bolt for the stock detent arm.


This is what comes out.

You will replace the detent arm and the spring with new Factory Pro parts.

Put in the new Factory Pro Microbearing Detent Arm and new heavier duty spring.

A good hint is to Loctite the pivot bolt with Blue  Loctite. Not absolutely required, but a nice touch.

Lever the arm out and slip in......  
the new Factory Pro Detent STAR. Install the center stud.  
There's the new detent arm and the new preproduction detent STAR.  
Here's how the shift pawl holder is assembled.

These are the spring loaded plungers.

Next, install the pawls.
Squeeze the pawls in and slip into the ID of the Detent STAR.  



Absolutely NO carb parts sold in California.

New and improved
Suzuki Teka SFI 2
with new TPS display and "MMT" Memory Module Tuner feature

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

no fax

Factory Pro
101c Roblar Drive
Novato, CA

If it's
4pm at Factory Pro it's 9am in eastern Australia.

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here

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
Clock widget          




The below links are people and companies that are consistently impressive with their continual uniqueness and dedication to providing traditionally valued, quality products and services.

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 -

Train to Win
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 and P-51 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! Call ahead in the winter.

Make your next tour Unforgettable,  Affordable and Exotic.
Superbike Tours Thailand - See you there.

Supwebike Tours Thailand
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.

Artisan Crafted Fine Cheeses – Since 1865   -    Specializing in Handmade Brie & Camembert

Marin French Cheese Co., also known as The Cheese Factory and Rouge et Noir is not just the oldest cheese manufacturer in the country, but a vacationers and day trippers destination as well as a unique part of American History. Located north of San Francisco, east of Napa County, west of Pt. Reyes and Olema and south of Sonoma County, Marin French has produced hand crafted Artisan soft ripened cheese since 1865. Rouge et Noir cheeses are similar to French and European varieties but reflect the characteristics of Northern California, producing it's own regional style.