[Ducati] 900SS - Wits End

[cedwards105]

What kind of carbs? Mikuni or Keihin or ...?

Sounds like one of your carb slides is sticking. Do your carbs have a 
throttle close cable or just an open?



----- Original Message ----- 
From: "Alex Pearsall" <rebelpacket at rebelpacket.net>
To: <ducati at ducati.net>
Sent: Wednesday, October 24, 2007 2:27 AM
Subject: [Ducati] 900SS - Wits End


> Hey folks,
>
> 900SS with a new set of JE 11:1 drop-in's.  Rings gapped at .020" to be 
> safe, squish set at .065" on both cylinders (also to be safe).  Retarded 
> the ignition two degrees (via pickup plate) and switched to 93 octane 
> fuel.  Bolt it all back together, new spark plugs, viola, starts up on the 
> first turn.
>
> Sync the carbs, but now the bike won't idle.  Adjust idle screw until the 
> bike idles, but a touch of the throttle sends the revs racing, usually 
> they don't come back down.
>
> Pull  apart the carbs, clean and blow-out every jet and circuit.  Clean 
> the float-bowls, set the height, clean the float needles.  All together 
> again, and the bike does the same thing.  Idles good, but revs race at the 
> touch of a throttle.
>
> Examine the plugs.  Vertical cylinder is a little black, but the 
> horizontal cylinder is white as a ghost.  Ahh, must be an air leak. 
> Examine carb boots, replace both gaskets on intake mainfolds and 
> re-torque.  The bike does the same thing.
>
> Scratch my head a bit, before I get brave and decide to spray some carb 
> cleaner all around the intake manifolds.  Engine doesn't turn any faster, 
> or slower.
>
> Finally figuring I may have made a mistake, I pull off the ignition cover, 
> re-check the pickup air gap.  Both perfectly in spec at .711 mm.
>
> What am I missing?  I'm plum out of ideas!
>
> -Alex
>
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