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.
|Keihin FCR Carb Recalibration Kits - patented Factory Pro HDJ style|
pn: CRB-CY45-1.7-RK $99.95
Dec 3 2007, 08:37 PM
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
This yz450f 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.
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
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,
05 rmz450 52+ int.
Factory Pro's Shift kit - help prevent missed shifts and damage caused by missed shifts.
(inc y45 star, 2s2 Arm, y26021-0501 spg, no gasket)
Feed back to
"How's it working? Aug 2012
Yes, works great! It's a must have item. 5th gear used to only last me about a month due to missed shifts, now I'm going on 3 months since my last rebuild.
Sault Sainte Marie, MI
yz250f wr250f Evo Shift STAR Kit
"99.7%" eliminate missed shifts.
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 - Shifts 5mm to 10ms quicker
Make shifting MUCH
quicker and virtually eliminate missed shifts. Helps address
missed shifts caused by poor shift detent "star" profile.
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.
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
Pro Shift Kit
(inc F-Pro Microbearing Detent Arm & spring)
2S2-18140-10-00 STOPPER LEVER ASSY and 90508-26021 apringarm
z95-y26021-0601 F-Pro Shift Spring
replaces 90508-26021 stock spring
The One, the Only, the Classic
Pro Shift Kit
Virtually eliminate missed shifts.
SLICK Hybrid Ceramic Microbearing detent arm - almost friction free roller and sturdy F-Pro Shift spring .
Major improvement in reducing missed shifts and improving shift speed.
Takes about an hour to install (right under the clutch basket)
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
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.
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.
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
Finally - Quick, easy, cost effective
with no expensive "add-on boxes"
fax 415 492-8803
Support /Tech SECTION
And most importantly
This Tuning Site has been visited by
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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!
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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
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