[Ducati] Carb Setting Info, 95, 900SP

[cedwards105]

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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