Cagiva // Ducati E900 Elefant

94 and on - all with stock Mikuni CV carbs


Finger Adjustable "Long Boy" extended fuel screws

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

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

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"Long Boy"
Finger adjustable 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
Carb Recalibration Kits

CRB-D15-1.1-TI  $99.95
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Carb Kit - 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.

If your bike is running too rich at low rpm and cruise, order new Emulsion Tubes (needle jets) - below


you sent me (overnite, thank you very much!) the ducati 900ss kit last month with needle jets (I also sent you the pix of my naked ST with a factory pro jet kit) and jeee-zusss! It may as well be a new bike. Float levels were 2-3mm high and once adjusted and everything installed, the bike was perfect _ started immediately idles smoothly and pulls hard.
The owner used to wear a bandolier of fresh plugs cuz she'd replace em every 80 miles or fewer in the front cyl...your kit (and setting float levels) made a huge diff.
John Foyston
portland OR

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

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.

$74 for 2 pieces

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

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Replace worn bare brass needle jets in stock carbs with Factory Pro's own stock replacement nickel plated needle jets.

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.

bad enough wear to richen low speed mixture

Float bowl gaskets

for BDST38 carbs
$16 for 2
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Lightweight Shift Centering Spring

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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?

TL-float height gauge    $59.95
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The BEST way to get set up to easily measure float heights - Universal tool




This Carb Recal Kit is the biggest selling kit in Italy! It was developed on the EC997a Eddy Current dyno and ROAD TESTED for best part throttle "snap". Make sure to adjust float heights when installing and tuning the Ducati!

Be sure to careful inspect the needle jets (it's the orifice hole in the emulsion tube) for any signs of ovality. Any wear in the hole will allow fuel to enter the carb bore in large droplets that do not burn efficiently and arrive in higher quantities than desired causing poor low speed operation.

Factory Pro stocks stock replacement emulsion tubes for Ducati, TDM/TRX, yzf750 and fzr1000 carb sets. Marc


Float Height Setting Trick for 38mm "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....  Marc
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



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

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415 883-5620

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EFI and Carb Tuning - Most all FI and carb tuning

by Wheelsmith Racing

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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.
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