yamaha yz450f, 04-07, FCR, Keihin, et, carb, tune, tuning, Data by EC997a Eddy EC997 dyno dynamometer Current Dynamometer

Yamaha

yz450f 02-08

yz450F, 04-09
(2010 is EFI and engine is different)

wr450f, 04-11

Improve throttle response, horsepower and mileage with the world exclusive Factory Pro HDJ Emulsion Tube - AND make better shifting - especially for SM racing where every shift counts. Ok - every shift counts all the time, so it's a kit that improves shifting all the time, no matter where you are riding.

Factory Pro just doesn't do off road jet kits - we've developed over 300 different jet kits and jetted literally 1000's of bikes - from AMA Pro races to local off road champions to the guys down the street with the Harley.

**True Rear Wheel HP tm**

Keihin FCR Carb Recalibration Kits - patented Factory Pro HDJ style
(sample pic) pn: CRB-CY45-1.7-RK $99.95 yz450f 03-08 1. Choose your shipping method 2. 800 869-0497 Available through Zip-Ty Racing 1-760-244-7028 iamcyclopseatme Dec 3 2007, 08:37 PM Newbie Group: Members Posts: 7 Joined: 29-October 07 From: Henderson, NV Member No.: 2277 I picked up a Factory Pro Jet Kit from www.factorypro.com They are a little pricey but WELL WORTH IT! My buddy highly recommended them and I do too now. Im not sure about all kits, but on my YFZ450 it was a little more than a simple jet kit. I had to drill my factory MAJ and add another MAJ (Main Air Jet). It was incredible and comes with everything you need. It uses the same jet sizes as the GYTR kit however you dont need as large of jets because of the MAJ modification. INCREDIBLE KIT! HIGHLY RECOMMENDED!	Now with the new, even cleaner running, patented Gen 2HDJ Hi Dispersement Emulsion Tube! This yzf450 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 FCR fine tuning work for that would agree with us. We really aren't egotists - We are just passionate about fine tuning. Figure better hot starts, better throttle response, less bogging and the Factory Pro bonus - 4% to 7% power improvement, pretty much everywhere 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! Thanks! 800 869-0497 Feedback 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.
New! Shift STAR Kit for Yamaha off road. Dirt bikes and street bikes are designed by the same people in the same factories and have the same shifting problems. This kit addresses the missed shift problems
SHFT-EVO-Y45-KT $239.95 yz450f 03-05 wr450 02-06 (inc EVO Shift STAR, Microbearing Detent Arm, but no Gasket) 1. Choose your shipping method 2.		yz250f / yz450f 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 Feedback 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

Factory Pro's
patented HDJ MAJ installation for crf / wr / yfz
Keihin FCR carbs

Where's my main air jet and what do I do with that drill bit and tap that came in my Factory Pro HDJ kit for my Keihin FCR carb?

First step is to eliminate the fixed main air jet restriction.
It's about 40mm down the MAJ hole (left picture).

Set your 3mm drill so that it has 45mm to 46mm of drill bit exposed from your drill chuck.
(see right picture)

Remove the stock emulsion tube (that's what the main jet screws into) so that you can clean out the carb well. By only having 45mm to 46mm of the drill bit exposed, it prevents you from drilling too far.

Then, use the supplied tap from our HDJ carb kit, thread the Main Air Jet (aka "MAJ") hole.
You only need to go far enough to be able to thread in the new replaceable jet that we supply.

Clean the hole, of course.

After it's clean, complete the MAJ Modification by installing the supplied Main Air Jet and installing the new Factory Pro HDJ Emulsion Tube.

NOTE!!!
If you aren't confident in your ability or in your understanding of what you are trying to accomplish - no worry - Call us up or talk to someone locally who has more experience in these matters.
If you are still not sure, see if there's a Factory Pro Tuning Center locally or visit your favorite local dealership or shop and get some help there -

We all have to learn, and usually having an experienced person around makes everything "easy".

This modification is something similar to what we've done in many different carb types over the years, though it might be new to some who haven't used our "1.7-RK" carb kits before.

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
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Novato, CA
USA

If it's
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parts information
info@factorypro.com

EC997 dynamometer information
info@factorypro.com

Product Support /Tech SECTION
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LINKS 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. Marc
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	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.

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