Honda TRX450r, 04-05

Honda TRX450er / r / 3a  06-14

Factory Pro's Shift stuff!
Help prevent shifting problems, missed shifts and dog and fork damage caused by missed shifts.
Classic  Pro Shift Kit

SHFT-EVO-H45/TRX450/04-14    $239.95

star, arm and spring kit

TRX540r and er  and 3a   04-14
(replaces 24312-KA3-741 star)

1. Choose your shipping method

TRX450r / er / 3a  04-14

EVO Shift STAR kit

Minrobearing detent
Arm, shift detent spring and Shift Star combination

Addresses missed shifts when riding hard. (A different problem than jumping out of gear after a hard landing- see GT Thunder spring below)


Ok I got the Stage 1 Pro Shift Kit and the optional star installed! Let me first off say that I do not work for the people that make the shift star or anything.

Now I didn't get a full days ride in but for the 45 minutes riding around on snowy icy roads it was everything they said it would be. Usually when on the icy snow when I'm shifting from first to second and the back wheel is still spinning it usually always would go right into neutral and VROOOOMMM. Now, every time, I mean every single time, no matter what rpm or load on the engine it goes so friggin smoothly into second it's onreal lol.

Now shifting in between all the other gears is such a positive with just one click and fully in gear. Before, idk if everyone experiences this but my 07 would like double click into gear and sometimes the shift lever would only go halfway up the shift stroke and not grab the second click. It's weird I know and definitely notchy from other dirt bike and quads I've ridden. I can definitely see the stock shift star wearing out shift dogs early from binding up and shifting halfway. The arm then clicks in each groove so the shift lever returns to middle stroke and is so beefier and with roller bearing. The whole shifting on my quad greatly improved to perfection. This thing should be included with an HRC kit - it's that's great. The price kinda sucks........ but I know for sure my trans is shifting perfect unlike before. I can't believe I'm the first to install one on the forum it blows my mind cuz it's that good.

Another thing before it was next to impossible once the motor warmed up to put the trans back into neutral without revving the motor up. Now I stop, shift to to neutral so simply and shut it off. It just bothers me the stock unit isn't like this. I bet there would be a far lot less worn out transmissions. I highly highly recommend this stupid
shift star. Especially if you fear splitting cases like me. So along with the gt thunder shift spring and this factory pro shift star I'm very confident that I have a solid trans. Unless of course there has been damage already done! If you don't have the gt thunder shift spring already then I would get there's when ordering it's ten dollars less for $30 (old price) and supposedly doesn't let the shift lever try to shift down when landing or casing a jump or through whoops.


GT Thunder
heavy duty shift lever centering spring

pn: z95-cntr-Hhp1-gt

TRX540r and er  and 3a   04-14
1. Choose your shipping method

TRX450r / er / 3a  04-14

The GT Thunder


addresses the "whole nuther problem" of the trans popping out of gear when landing hard off high jumps.

Carburetor Recal (recalibration) Kit


(sample pic)

pn: CRB-4H45-1.0  04-05    $79.95

1. Choose your shipping method


    The Honda TRX450ex 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.

   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.

    So - Here's the power - Buy it!


800 869-0497





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.