Do singles have valve guide seals?

[gregwils]

I was looking in an old Clymer manual last night. In a drawing explosion of the head it showed something called a "valve rubber" sitting at the top of the guide, but my Ducati parts manual shows nothing. Do 250's and up have seals? I haven't pulled my head off yet to know, just curious if anyone knows the answer.

[double diamond]

The early 4-speed 250's didn't have a valve guide seal. The guides were tapered at the top. 5-speed models and perhaps some later 4-speeds have valve guide seals that are retained by a groove machined in the OD of the top of the valve guide. The seals are just a little rubber cap, no springs or metal sleeves like modern valve seals. Matt

[Jon Pegler]

Just out of interest, the late Spanish singles (Strada, Forza and Vento) did have valve guide seals more like a modern car.
I. E. They had springs and steel collars and fitted onto a plain valve guide, without the groove machined in the OD at the top of the guide, as in most of the other singles.

Jon

[gregwils]

Ok, thanks. I guess I will find out when I pop off a valve cover.

[DewCatTea-Bob]

By: gregwils...
" but my Ducati parts manual shows nothing. Do 250's and up have seals? "

____ While the pages of your parts-manual which depict the cly.head may not,, (like the camshaft), the valve-guide rubber-seals may be found on another/different page within your particular manual.
__ The seals are the same as used on many* early 750 L-twins.
(* Some of the L-twins employed larger rubber-seals which incorporated a coiled-spring.)


Dukaddy-DUKEs,
-Bob