[Ducati] Carb Setting Info, 95, 900SP

[Jim Calandro]

Mike

If cutting down on air flow, air filter and air box lid, made the situation 
worse then I would guess you have a rich condition and depriving it of air 
made it richer.  With that logic I would say lowering the needles might help 
as they will cut back on fuel flow and make it leaner, the direction I think 
you might like to head.  Look at the jet sizes and compare them to stock to 
see what has been done.  I suspect the owner went up a few jets too many.

I pulled out the Ducati service manual I bought back in early 94 and it says 
it should have the following

Mikuni
Type            BDST 38-B67
Choke                     38
Needle Valve jet       Y-2
Main Jet                    140
Starting Jet                70
Idling Jet                    42.5
Needle Jet                5C19
Pos from top            4th

I do not think they changed much of this over the years but they could have 
gone leaner for EPA reasons but this would be a good starting point.

Jim

Jim Calandro
il Capo
US DESMO
www.usdesmo.com
704-843-0429
----- Original Message ----- 
From: <Ducati5555 at aol.com>
To: <ducati at ducati.net>
Sent: Thursday, February 28, 2008 9:37 AM
Subject: [Ducati] Carb Setting Info, 95, 900SP

> The bike ran ok, except it has a stumble when you crack the throttle. 
> Full
> throttle it seems to run ok.  But just cruising is very  annoying.  The 
> bike
> has aftermarket exhaust.  When I pulled the tank  up I noticed it had no 
> airbox
> lid or air filter!.  So I bought a K and N  and found a lid off of Ebay.
> Installed them and the stumble is now even  worse.  I have no idea what 
> was done
> to the carbs.
>
> Obviously, the carbs need some work.  Is there like a baseline to  start
> with, with the mods I have mentioned?  Pilot jet, air mixture  adjustment, 
> etc?  I
> have adjusted Keihin carbs on my Monster and on all my  dirt bikes, but 
> have
> no experience with Mikunis.
>
> Thanks
> Mike