Factory Pro's Shift STAR kit - help prevent missed shifts and damage caused by missed shifts.
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
Microbearing shift detent arm and F-Pro shift spring
yz250f / yz450f 14-15 only
replaces 1SL arm and 90508-26080 stock spring
F-Pro Shift Kit
The arm and spring kit.
The Pro Shift kit Microbearing Detent Arm and F-Pro Shift Spring will upgrade your bike.
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 3ms to 5ms quickerMake shifting quicker and help eliminate missed shifts. Helps address missed shifts caused by weak spring.
Helps prevent shift fork and gear engagement dog damage caused by missed shifts.
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
patented HDJ MAJ installation for crf / wr / yzf
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.
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.
Yamahas yz250f and yzf450f Shift STAR Installation
|Remove the clutch cover.||Remove the clutch
(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
These are the spring loaded plungers.
|Next, install the pawls.|
|Squeeze the pawls in and slip into the ID of the Detent STAR.|
|Absolutely NO carb parts sold in California.|
New and improved
Finally - Quick, easy, cost effective
with no expensive "add-on boxes"
Support /Tech SECTION
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