John Whittingham <[EMAIL PROTECTED]>:
> I know from personal experience getting "0"
> clearence on the Desmo closing rockers can be time consuming
when you
> have to stone the shims down on the wet stone, having said
that they're
> likely to last 20-30,000 miles when done right.
Unfortunately, this is typical Ducati lore due to the scanty
information provided in the manuals and aftermarket workshop
books.
You should never stone down the shims to size. That weakens the
surface hardening. A new shim of the correct size or a well used
but not worn out shim is greatly preferable. And you should aim
for .001" clearance on the closers when making an adjustment,
not zero clearance. Closers are tolerant of up to .005-.006".
More important than that is to rotate the cam through an entire
revolution with both valves installed to be sure there is no
binding anywhere, and check the keeper collets whenever you're
doing an adjustment to be sure they're not battered up too
badly.
I've written many articles on Ducati maintenance over the past
15 years. Most people follow the improper procedures because the
factory never really articulated setting the valves outside of
the factory technician workshop.
Godfrey
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