Question about 2002 Ducati 900 Sport

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Idle adjustment I cannot run the motor without the choke being on

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Hi and welcome to FixYa,

Initially, the "choke" in a 2002 Ducati Sport 900 is not really a choke, it is an idle lever that increases the idling slightly above normal. A real choke would enrich the mixture by adding more gas and limiting the air and is performed by the ECU. This conditioned is triggered by the temperature sensors and kicks in only when cold. Corrective action would then be to adjust the idle RPM.

Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 29, 2008

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2. Fuel filter clogged.

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4. Float needle and seat sticking.

5. Float level too low.

6. Carburetor bowl vent line clogged/blocked/pinched.

7. Idle adjusting screw set too low.

8. Air/fuel mixture screw set too lean.

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5. Float level too low.
6. Carburetor bowl vent line clogged/blocked/pinched.
7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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9. Idle port, transfer ports, slow air jet clogged.
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5. Float level too low.
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7. Idle adjusting screw set too low.
8. Air/fuel mixture screw set too lean.
9. Idle port, transfer ports, slow air jet clogged.
10. Slow fuel jet clogged.
11. Faulty fuel pump.
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I also own a 1980 GS550L that had a similar problem, first thing I did to fix it is to add a can of seafoam to a half of tank of gas or less. The bike can run on pure seafoam if needed. Let it run for 3-5 minutes and shut if off. Let it sit for another 5 minutes then start the bike and take it for a ride. After 20 or 30 miles go ahead and fill the tank up with gas. Within a tank or so you should start noticing it idleing better and more power. On the GS550 the choke self adjusts as you use the throttle. There is no need to push it in the rest of the way. Even if you are extremely hard on the bike opening the throttle all of the way it will never go all the way in unless you push it all of the way in. I own two GS's and niether of which prefer to idle if I push the choke all of the way in. Once I did this and learned just to leave the choke alone and let it stay where it self adjusted as I rode the bike it has never stalled since at a light. You should be able to pick up a can of seafoam at any local autozone or advanced autoparts. Most likely your idle circuit on the carb is currently gummed up and the choke circuit is all that is that is working. Myself and freinds have used Seafoam to solve this problem and just about anything with a motor that was parked with gas in for an extended amount of time without any stabilizer added. It's well worth the $8 versus pulling the carbs apart.

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