[Ducati] Carb Setting Info, 95, 900SP

Thu Feb 28 11:37:25 EST 2008

I had all sorts of problems with my 93 db2.  When I was looking to work on 
the carbs I noticed the opening in the air box was about the size of a 
quarter.  Either of the two carbs had bigger throats so I just removed that 
little nose piece from the air box and all my problems went away.  Not only 
that but with the bimota full flow exhaust it would pull hard to the 9K red 
line  Classic case of too lean do to air flow blockage so I would say you 
can safely stay with the stock carbs.  I also had a 95 900 SS/SP and it was 
a wonderful bike and would pull hard to about 8,500 rpm.  It has a K&N 
filter, open air box and after market mufflers.  I checked my maintenance 
records and unfortunately I did not write down the jetting changes that were 
made to it.

Jim

Jim Calandro
il Capo
US DESMO
www.usdesmo.com
704-843-0429
----- Original Message ----- 
From: "cedwards105" <cedwards105 at cfl.rr.com>
To: "Ducati Owners Group" <ducati at ducati.net>
Sent: Thursday, February 28, 2008 11:32 AM
Subject: Re: [Ducati] Carb Setting Info, 95, 900SP

> My Bimota Db2 has a '93 900SS engine and stock Mikuni carbs. Even after 
> two days of dyno testing and jetting, we could not dial out the stumble 
> and lag getting back on the gas.
>
> Keihins fixed the problem.
>
> ----- Original Message ----- 
> From: <ducati5555 at aol.com>
> To: <ducati at ducati.net>
> Sent: Thursday, February 28, 2008 11:14 AM
> Subject: Re: [Ducati] Carb Setting Info, 95, 900SP
>
>
>>
>> thanks Jim
>>
>> good info, will take a look over the weekend.
>>
>> Mike
>>
>>
>> -----Original Message-----
>> From: Jim Calandro <capo at carolina.rr.com>
>> To: Ducati Owners Group <ducati at ducati.net>
>> Sent: Thu, 28 Feb 2008 7:51 am
>> Subject: Re: [Ducati] Carb Setting Info, 95, 900SP
>>
>>
>>
>> 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?
>> ?
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>
>
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> 2007
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>
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