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After an expensive tune-up by an excellent Ducati mechanic (Desmosedici trained in Italy) I still had the initial stumble when starting out, like one cylinder stops participating until more throttle is applied, and I decided to tackle it myself using a little gadget (pictured) I bought over 30 years ago for synching carbs on old MG and Triumph twin-carb cars. It measures actual air flow instead of manifold vacuum, and that seemed a better way to synch the throttle bodies. I closed the air bypass screws completely, balanced the TBs, and brought the idle up to 1100 rpm with the main screw adjuster on the linkage, leaving the air screws closed. The mechanic spent considerable time setting the CO, so I did not disturb that adjustment, although I probably altered it by closing the air screws. I also suspected the TPS was off, since cracking the throttle a tiny bit made the stumble go away, and I moved it back and forth until I found the "sweet spot" at idle speed. Considering that all the requisite electronic wizardry had been used for the tune-up, this procedure could be expected to produce a really rough-running engine, at least from a theoretical standpoint. Much to my delight, it no longer stumbles, and runs better than any Duc I've had! Now, I ask, does this mean that all those factory procedures, measuring vacuum, volts, and ohms, are not really a good measure of the situation, or did I just get lucky?
I forgot to mention the bike involved: 2001 996 with Termi half-system and appropriate chip.
I forgot to mention the bike involved: 2001 996 with Termi half-system and appropriate chip.
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