Honda TRX400ex, 99-14

Carburetor Recal (recalibration) Kits

(sample pic)

TRX400ex    99-14   $69.95


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    The Honda TRX400ex 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.

    So - Here's the power - Buy it!


800 869-0497

Shifting Kit

2-3 weeks handling time - no core charge)

pn: z95-HHN1-xxxx  spring


 TRX400ex, 99-08
TRX400x, 09-14
24435-HN1-000 spring

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F-Pro Shift Spring - stage 1

Make shifting quicker and virtually eliminate missed shifts.  

Bring your shifting up to high performance  levels.

Takes about an hour to install - It's under the clutch basket..




 for the first guy to order a Spring and Arm set:
$200 + shipping

415 883-5620


TRX400ex/x  Microbearing Detent Arm
2-3 weeks handling time - no core charge)

pn: SHFT-ARM-HMT3-steel

TRX400ex, 05-08
TRX400x, 09-14
24430-MT3-000 arm-no gasket supplied

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TRX400  Microbearing Detent Arm   stage 2

Make shifting  quicker and virtually eliminate missed shifts.  

Bring your shifting up to high performance  levels.

This is the FP Microbearing detent arm.

Reduces shift drum friction for more precise shifting - quicker shifts, virtually eliminates missed shifts.

Takes about an hour to install - it's under the clutch basket.

Shift star   original Honda 99-08     pn: 24411-HN1-A40  (not H45)
Shift spring   original  Honda 99-14   pn: 24435-HN1-000







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

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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...
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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.