WR450f   04-06 and 07-15

**True Rear Wheel HP tm**


Factory Pro Shift STAR kit - a MUST HAVE to virtually eliminate missed shifts


SHFT-EVO-Y45-KT   $239.95

wr450f 04-15

(inc y45 EVO STAR, 3xk Arm, z95-y04 spring, no Gasket)

replaces 2s2 stk star, 3xk arm and 26021 spg

1. Choose your shipping method

quad      yfz450  09-20   2s2

quad       yfm700r     13-20    2s2

     bike    WR450f      04-15     2s2

Evo Shift STAR Kit

The EVO Shift STAR Upgrade kit will upgrade your bike to the latest, greatest shift action.

Perfect for when you are tired of paying attention to shifting and just want it to shift right. MX. SM, Desert,  trail -

Virtually eliminate missed shifts  - decreases shift process 5mm to 15ms (must re-set shift kill duration if using a Quickshifter)

Make shifting MUCH quicker 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 Yamaha.

Installation: Slightly more complicated than replacing the clutch basket.

No case splitting required.

Installation Instructions - click here


Yamaha 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


Keihin FCR Carb Recalibration Kits - patented Factory Pro HDJ styl


(sample pic)

pn: CRB-CY46-1.7-RK    $99.95
wr450f 04-11

1. Choose your shipping method


Marc, First I want to thank you for the quick reply, you guys are the best.

 The '04' yz250f with your kit seemed to make a huge difference from mid throttle to wide open, and same with the '06'

The CRF450r flat out screamed on top. Amazing!

The '08' CRF250r
seemed to make the most improvement in the  mid throttle range, the guy was in a hurry to get to a race and I only made recommended changes with one test ride (for me not enough testing) but I talked to him a cpl. weeks ago and he said it was running great.

I agree with you, I don't know why more mx'ers don't use your kits - they are hands down the
pinnacle in jet kits.......

...... So can you help me out with the '07' Rmz-250, my son is getting faster moving to the intermediates and
needs more power.

Your #1 fan,
Chuck Sheets
05 rmz450 52+ int.


Now with the new, even cleaner running, patented
Gen 2HDJ
Hi Dispersement Emulsion Tube!

The wr450 carb recal kit was designed with as much care and attention to detail as we give to our EC997 dynamometer and test routines, our Shift STAR shift improvement kits, our Billet Engine Covers and all of the other products that the quickest road racers in the USA and World used to collect a total of 9 WERA and F-USA national Championships - along with the Suzuki Cup World Champion, Rob Jensen.

    We've now entered the off-road arena to bring some new, exciting, well proven concepts, such as our easily tuneable "HDJ" style jet kits and several other things that we've picked up along the way.

    One of the improvements was dyne systems design and test routine design - We have been saying for years that inertia dynos were misleading and now, these new "HDJ" carb kits show how much better the EC997 load dynos are than inertia dynos when it comes to developing any performance products. Sounds a bit egotistical? Perhaps it sounds that way - but, I think that we've got quite a few local Norcal racers that we've done fine tuning work for that would agree with us.

    We really aren't egotists -  We are just passionate about fine tuning.

   The Factory Pro HDJ kits, designed by Marc Salvisberg, will run more evenly over a wider temperature and altitude range than any other carb kit and will produce 3% to 8% better power than another carb with the "best main jet" in it, when properly tuned and tested under a real load. This does not mean an inertia dyno - though, power will be better with a dealership level dyno, also.


800 869-0497

 Ty Davis / Zip Tie Racing / CA  
Wheelsmith Racing 1 415 472 4962

Billet Engine Cover

Billet Engine Cover

Awesome Billet Clutch Cover!!!! Like our CRF, DR and KLX Covers - Virtually Indestructible!

Designed and manufactured by the same people who make the toughest roadracing engine covers in the world - Factory Pro engine covers stay together and laugh off 140mph lowsides!!

Machined from a solid block of incredibly strong, fine grain, extruded aluminum alloy in northern California on the latest in high performance CNC machining centers.

Offroad and comp tested every weekend (and sometimes during the week!) - crashed by the best of us and still looks like a million bucks.

Make your friends slow down to check out your SWEET "billet" cover!

Unlike the stock, cast aluminum cover - the Factory Pro cover, almost 99% of the time, prevents the brake pedal from punching a hole - You'll make it home!!

A lightweight 368g - or.... less than a "1/2 quart of oil" heavier than the brittle, stock clutch cover.
In other words, the cover weighs less than that quart of oil that the broken stock cover left on the trail.....

and it looks bitchin'!

$189.95 Intro Special!
pn: COV-CY45-CC
*note: does not fit 426*


Improve your shifting

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.  

Factory Pro Around the World

Winter in Moscow, 2009
Winter in Moscow, 2009


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


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