[Ducati] Throttle body synching

[John Filak]

Garth,
The point of an off-idle sync is to load the throttle cable(s). So
pick any RPM you like, as long as the throttle body stops are no
longer in play. I like 4K as that's where I generally ride when not
riding agressively - somewhere near the bottom of your powerband is a
good place.

The cables should have individual adjusters; probably right where
they attach to the bodies. The cables should have slack at idle. Set
the idle speed and balance the bodies. You may need to go back and
forth a few times until everything is where you want it.

Now use the throttle to increase the rpm, bringing the bodies off
their stops so the cables are controlling everything. I use a large
o-ring between the throttle grip and the kill switch housing as a
"cruise control" so I don't have to hold the throttle with one hand
while I try to make adjustments with the other.

The balance should remain the same. If not, then the cables need to
be adjusted to keep the bodies in balance. If you make any cable
adjustments, be sure you maintain slack at idle, otherwise you'll
mess up your idle balance. Re-check both conditions when done.

This is the stuff that keeps your bike running perfectly. :)

Best,
John


--- Garth Williams <garthw at houston.rr.com> wrote:

> John,
> 
> Thanks for the input.  I do realize that the synch must be
> performed 
> while running (like I said, the tool measures vacuum- not much
> vacuum 
> when the motor's off). 
> 
> My idea was more along the lines of moving the battery, relays, ECU
> and 
> other stuff on the airbox just over the side of the frame (on a
> table or 
> something set up specifically for that purpose) while I did the
> synch.  
> If that's not the procedure and the adjustment screws are
> accessible 
> with the airbox on, so much the better.  That airbox is a pain in
> the 
> ass to get back on anyway. 
> 
> You made the comment that you must also do an off-idle adjustment. 
> Is 
> there usually a specific RPM at which this is done?
> 
> Thanks,
> 
> 
> Garth
> 
> 
> John Filak wrote:
> > --- Garth Williams wrote:
> >   
> >> The bike is a 99 SS900 (fuelie). Where ... is the
> >> adjustment screw on each throttle body? And can I
> >> get to these screws without removing the airbox
> >> (and battery, and ECU, relays, etc.). 
> >>     
> >
> > Garth, (and list),
> > Wow, this is my first post in over a year, so anybody new since
> then
> > won't know me and the ones who have been around, may not
> remember. To
> > those that do ... Hello again!
> >
> > Throttle body syncs must be performed while the bike is running.
> > Therefore, removal of the battery, relays, ecu, would be contrary
> to
> > the procedure. Typically, the fuel system adjustments are
> performed
> > as the final operation in a tune up, that is, you should have
> already
> > completed your valve adjustments and anything else, like plugs,
> > filters, etc.
> >
> > Throttle body syncs are also typically done at idle and off-idle.
> >
> > Can't help on the actual location of your adjustment screws,
> sorry.
> > I've never worked on a FI 900.
> >
> >
> > John Filak
> > Potterstown NJ USA
> > http://users.nac.net/filak
> > '00 BMW K1200RS
> > '96 Ducati 900SS/CR
> > '97 Ducati 916
> >
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> 
> 
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