Ducati 900ss / 900cr / 900sp
91 -

 (w/ stock 38mm downdraft CV Mikuni carburetors)

Finger Adjustable "Long Boy" extended fuel screws

Long Boy Fuel Screw Kit
pn: 3020m1-D09
replaces 13440181a

 with 2 new extended screws, springs, washers and o-rings.

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"Long Boy"
Extended Fuel Screws

Frustrated with trying to find an "almost 90 degree"  screwdriver to fine adjust your fuel screws for best idle and cruise?
Use Factory Pro's new "finger adjustable" fuel screws to adjust fuel screws for best throttle response. Traveling to high altitude? It's easy to lean out the lowend temporarily.

Make your life easier!

Remove old short stock fuel screws, old o-rings, old washers and old spring. The o-ring might be stuck in the carb, so, take a light and make sure it's really out if it didn't come out with the screw (or you can't find it after you took out the screw)
Use a small bent wire to pull it out if it doesn't drop out. Keep the old parts for "spares".

Each screw assembly comes with:
2 Long Boy fuel screws 
 2 new o-rings
2 new washers
2 new springs


This Factory Pro Carb kit,  new Factory Pro plated needle jets and finger adjustable extended fuel screws

Carb kit inc needles, tubes and fuel screws

$209.95  combination price

Saves on shipping

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A Fresh start

1. Ti Pro carb kit
2. new nickel plated emulsion tubes
3. extended fuel screw set

The number 1 internet recommended Ducati kit.


Hi Marc
Received parts with thanks on Monday, Excellent service!
I have fitted the needle valves, The Duke runs a treat, best it's ever been.
Once again, thanks for the great service and superb replacement parts.
Steve Klee  UK
November 2006
Factory Pro Carb kit only
(without new Factory Pro needle jets or fuel screws)

Standard Premium drop-in carb kit

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(carb kit only)

Adds more low-end / midrange, if the proper main jet is selected, more top-end power. Easy to install and tune - no slide drilling!
Suggest using a BMC replacement air filter for increased airflow.
Make float height setting easier! Pick up a Float Cage Holder for Mikuni 38mm carbs  -
See bottom of this page -
This is the kit that brings back that lowend performance that you lost with that dynojet kit -
Factory Pro Carb kit only
(without new Factory Pro needle jets or fuel screws)

Standard Premium drop-in carb kit

pn: CRB-D09-3.1-ti

for open top airbox or pod filters
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Adds more low-end / midrange, if the proper main jet is selected, more top-end power. Easy to install and tune - no slide drilling!
Make float height setting easier! Pick up a Float Cage Holder for Mikuni 38mm carbs  -
See bottom of this page -

This is the kit that brings back that lowend performance that you lost with that dynojet kit -

 New main jet o-rings 
6 pcs
Mikuni # 007-790

$5 for 6 orings
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o-rings for Mikuni
"press-in" n208099 main jets.

If you are jetting older carbs, it is a good idea to get new main jet o-rings when buying a carb kit.
Nickel plated needle jets - Factory Pro

CRZ-EMU-100120K  $74 set of 2 pieces

(replaces 13240041A - Ducati calls it a "needle valve")

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(replaces oem duc pn: 13240041A)

Factory Pro design stock replacement Emulsion Tubes / Needle Jets

worn needle jets in stock carbs. The needle, stock or aftermarket, will wear the needle jet orifice oblong - causing excess fuel to flow at cruise and low rpm. Additionally, the fuel that does get released is in larger, less burnable droplets. Replace the emulsion tubes / needle jets if there is more than 10k miles of varied use or 5k miles of in town driving on the bike before trying to tune. You will save time and energy.
Note that, with fuel level adjustments, you can make some mixture adjustments with the
"fuel level", as adjusted by "float height" changes.

Float bowl gaskets

for BDST38 carbs
$16 for 2
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Lightweight Shift Centering Spring

Click Here to buy


Just rode bike awesome shifting, smooth, smooth smooth
Mike Hoak
August 2013

Lightweight Shift Centering Spring

For when you decide that you want lighter feeling shift lever action for better feel.
A lighter foot shift pressure is less unsettling.
Decreases lever effort required to make a shift.
 Makes foot shift pressure more like other sportbikes.
Since you are not having to push so hard to move the lever, it's easier to find neutral.

Like your rearsets? But, no matter how you lube, shim, adjust the arcs, angles and lengths, it's still annoyingly stiff to shift?
Float Height setting tool - relatively universal

TL-float height gauge
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model 95SS 95 94 x 96CR
exhaust stock Carbon Tech slip-on Staintune Aircone of Nevada D&D slip-on
muffler stock comp quiet straight thru straight thru
filters stock no top,K&N stock w/o snorkel stock w/o snorkel BMC/stock lid/no snorkels
advancer stock stock stock stock stock
pilot #40 #40 #40 #40 #40
fuel screws 3.5x 2.5 to 3.0x 2.5x 3.0x 2.5-3.0x
float height 15mm 15mm 14mm 14mm 14mm
needle/pos #4 #4 #2 /4 1180g4-102n-44t5/4
main jet 122.5 #130 #130 #127.5 #130
ave. temp 75 f 70 70-80 aprox. 70f 92f
humidity dry dry moderate moderate 38%
barometer x x x x 30.06
elevation sea level sea level sea level 1200 sea level
shop Wheelsmith x Wheelsmith x WSR
location San Rafael, Ca. Anaheim, C A San Rafael, CA Oklahoma City, OK San Rafael, CA
installer Wheelsmith Tom G. Raul Hank B. P. Verdone

Hi Marc,

Installed the full Perfect Mikuni Ti rebuild kit in our recently acquired 900ss. The bike is a very clean example with only legit 4700 miles on the clock.

—Stock air box
Snorkels in
—KN filter
—Stock header
Remus CF slip-ons (same as Ducati Performance of the day)

Carbs looked like they were brand new when pulled, with some very slight wear to the original needles and tubes and a very poor synch job.

Best (perfect, actually)setup for us in Santa Monica, California:
—130 Main Jet
—40 Pilot Jet
—Needles at position 3
—Vertical Fuel Screw at 3.75 turns out
—Horizontal Fuel Screw at 3.5 turns out

The Duc now pulls clean and hard from 1100 RPM idle straight to redline, with no backfire on decel and plugs that look great. Warm-up is easy, with very little choke needed for just the first 30 seconds or so.

Thank you,
Greg and Noah Pinto

Thanks for the springs.  Got them last week and installed the jet kit over the weekend along with new exhaust cans...it's like a whole new Monster.   Very impressed overall with the kit and your service.  I'll definitely recommend the kit to my friends.
Thanks again.
Perry Steen









Float Height Setting Trick for 38 Mik's
One of the problems with setting the float height on the 38mm downdraft Mikuni's that come on Ducati's, yzf 750's, tdm 850's and fzr1000's, is that the darn white plastic "float cage" keeps popping out of the carb body unless you hold it in.

When you hold it in with your fingers, you always flex the cage frame and distort the reading that you are setting the float height at..... Aaarrggghhh!!  :-)

After spending 45 minutes setting some yzf750 carbs in the sweltering Mid Ohio heat of summer, I decided to make a float cage holder and sell 'em! I'd make a million  $$!!

When I got back to work, I set up and made a pile of cute little flat braces.

As I was sitting there, admiring my cleverness...... one of my parts guys wandered by and asked what was I making? I showed him that you could just take my clever little piece of aluminum and hold those float cages right tightly up into their seated position - so you could get consistent float height readings.

He says.....
It looks like you could just put the float bowl on with the front holes on the bowl lined up with the rear holes on the carb body and slap some screws in and it would do the same thing...........
I bought him lunch with the million $$ I didn't make....



Hello.  Here’s the pics you asked for!  Thanks for the help, the bike runs BEAUTIFULLY now, lots more power!  The front end now comes up on the throttle – whereas it didn’t before!  There’s another pic in there too where I used a bar code to measure the bowls.  I found this a lot easier than using a ruler.  I measured the bar next to the number “8” on my barcode to be the recommended height on my bike – 14mm.

-Mike Beary

Thanks Mike, for the pics!
Marc Salvisberg


Accessories of quality




New and improved 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 - 6pm, Pacific time, -7 or -8 GMT

800 869-0497
 USA and Canada

415 883-5620

fax 415 492-8803

parts information

EC997 dynamometer information

Product Support /Tech SECTION
click here


Mailing / Shipping address:
Factory Pro
179 Paul Drive
San Rafael, CA 94903

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

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EFI and Carb Tuning by Wheelsmith Racing
The Rich Oliver Mystery School will help you discover your hidden inner strength. 
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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 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.

Maybe in next rewrite, he'll fix the ignition timing and dyno chapters...
Otherwise great book with great starting ideas.

My bible

The little blue bible for quick references and little known facts.