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Old April 16th, 2019, 06:26 AM   #1
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!989 900 Supersport Carbs

Hi,
I have just picked up a 1989 900 Supersport, can someone please tell me what carbs should be fitted, mine has Mikunis fitted and the air box has been modified.
Cheers
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Old April 18th, 2019, 05:29 PM   #2
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A quick look through the Complete Book of Ducati indicates there wasn't actually a 1989 900 Super Sport. There were 1990 model year bikes built starting in September of 1989. According to the same book, the bike would have been equipped stock with a Weber carburetor that was considered problematic. That's what the book says.



However, the Haynes manual I have for the 900SS covers all the two valve twins from 1991 on and states that all of them have the dual Mikuni carbs.



Considering the two differing sources and the information gap with the Haynes manual, my guess is (and it's only a guess) that your particular bike was converted from the problematic Weber carb over to the dual Mikunis that were fit from 1991 on.



Again, this is only a guess. I've read several sources that state the 1990 bike were equipped with a Weber carb so I'd further guess this to be fact. One I used to form the above guess regarding the Mikunis.



Hope that is of some help....I've read the Weber carb was impossible to keep in tune and anyone who was serious about keeping their bike ditched them for any other form of carburetion.



Also, there wasn't a whole lot of really good record keeping back then so what one person may regard as fact, based on their own bike, it is impossible to know if that fact applied 100% to all the bikes that came off the assembly line that particular year. Or even on the same day.....sean
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Old April 19th, 2019, 01:28 AM   #3
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The 750 F1 (from about 1985 to 1988) was followed in about 1989 by the 750 Sport and the 900 Supersport; the 750 was red/blue, the 900 was red/white. They each had a Weber double body carburetor, the 750's being a 44DCNF 113, the 900's being a 44DCNF 116. (from the factory brochures)

I recall that the Webers were supposed to be difficult to get right on these bikes.

The all-new 750 and 900 from 1991 had Mikunis.

(NorCal: I have been following your work on the 1993 900.)

edit: according to one of my books, the 750 Sport was first available in July 1988 (blue and red); from mid 1989 a red & silver version and there were some in black & silver. NorCal you are correct: the 900 Supersport first appeared/was built from Sept/Oct 1989 as a 1990 model.

Last edited by Alice Breil; April 19th, 2019 at 05:18 PM.
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Old April 19th, 2019, 08:26 PM   #4
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Well, HEY! Thanks for following my resto-mod build. I was hoping to make a great deal of progress this weekend...but it's Easter so I'm off to my inlaws instead.



The books I have contain the same information you posted. The Webers were known to be unreliable and difficult to set up right.



That's what I remember people telling me, and one of my buddies who got so fed up with how much the Weber over fueled he finally just ditched it got a Dellorto set up that worked well.



I don't know how many times he swapped jets and tried to get it to run reasonably well. He got close but no where near what he got from the Dellorto set up.



I don't remember what it consisted of part number wise nor how he figured out what part to get. This was well before the days of the internet and cell phones.



It was, similar to the Weber in that it was a double body carb but it was significantly easier to get set up and going. He got it going as I remember but was still working on getting the tuning just right.

I left for another duty station before I really got to see it in action though so take that for what its worth......sean
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My garage:
Twins:
2000.5 Aprilia Mille R
2000 Ducati 996
1996 Kawasaki EX500 basket case
1993 Ducati 900SS


Suzuki collection
2004 GSXR 600
1992 GSXR 750 oil boiler
1983 XN85 Turbo

Last edited by NorCal996; April 19th, 2019 at 08:28 PM.
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