Question about Ducati 400 SS Motorcycles

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I have a ducatti 400ss it is idiling too slow, and I would like to know how to adjust the idle. A diagram of the engine and how to do it myself would be very helpful. thanks, cheryl

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Hi and welcome to FixYa, I am Kelly.
This may not be the answer your looking for but the idle adjustment is in the owners manual.
You can download the owners manual (Monster 400) and the service manual for $3.50 Euros each here: http://www.duc.nu/manuals/

If you search using this page use Monster 400 in the search panel:
http://www.duc.nu/manuals/search.php
2 manuals come up Owners manual 2000 (1 mb) Eu $3.50 (Covers electrical also)
and workshop manual 2004 (111 mb) Eu $3.50
Both are downloadable and at the listed price it is a good investment in Ducati ownership and maintenance.

Thanks for choosing FixYa,
Kelly

Posted on Mar 24, 2011

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On some float-type carburetors, you can adjust the air-fuel mixture and engine speed at idle. Check for an idle speed screw designed to keep the throttle plate from closing completely, and an idle mixture screw that limits the flow of fuel at idle. If your carburetor contains these screws, proceed below.
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  2. Locate the idle mixture screw and turn it clockwise until the needle lightly touches the seat. Then, turn the screw counterclockwise 1-1/2 turns.
  3. If your carburetor has a main jet adjustment screw at the base of the float bowl, turn the screw clockwise until you feel it just touch the seat inside the emulsion tube. Then, turn the screw counterclockwise 1 to 1-1/2 turns. Replace the air cleaner assembly and start the engine for final carburetor adjustments.
  4. Run the engine for five minutes at half throttle to bring it to its operating temperature. Then, turn the idle mixture screw slowly clockwise until the engine begins to slow. Turn the screw in the opposite direction until the engine again begins to slow (image A). Finally, turn the screw back to the midpoint.
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  6. With the engine running at idle (image D), hold the throttle lever against the idle speed screw to bring the engine speed to "true idle." Then, repeat the idle mixture screw adjustments from Step 4 to fine-tune the mixture (image C).

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