Help with 450 Desmo Valve Seals needed!

[Stratos23]

Hello,

Does someone have some dimensions for 450 Desmo valve seals? These are the O-RING type seals rather than the cap style as fitted to later/twin cylinder models. Part number is 0400.17.030.

The reason for my enquiry is because I've received some new replacement seals from a certain Ducati supplier, but they are significantly bigger than the ones that came out. It could be that the old ones were incorrect, but I doubt it, since they were a good fit (the new ones seem too large for the recess in the guide).

OLD SEALS:
OD - 11mm
ID - 7.85mm
section - 1.7mm

REPLACEMENT SEALS:
OD - 12.7mm
ID - 8mm
section - 2.3mm

Here is a diagram of dimensions and a photo for reference.





Can I use a generic O-Ring - which would obviously need to take the heat of the application?

It sounds like a silly little issue, but it’s all that’s stopping me putting the head back together after a top end freshen and bike needs to be back on the road ASAP. Any info or advice would be hugely appreciated. Many thanks in advance,

Greg

[ducwiz]

They are the same for all desmo singles, 7.65x1.78mm, FPM (DuPont Viton) rubber, which is a high temp. grade material. You easily identify it by it's brown color.
The dimensions correspond to #011 ISO 3601-1, or OR2031 UNI standard. Your "replacements" are too thick, won't fit into the guide's groove.

Hans

[Stratos23]

Hello Hans,

That's twice you've helped me out of the dark with valuable and detailed information - hugely appreciated! You're an encyclopedia of information! I used the dimensions of the hub parts to sent me to make my own spacers up - they worked perfectly. I'm gradually working my way through the bike.

Funny, I've been meaning to email you for a while now - good to stay in touch with like-minded types around the world. I'll send you a more general news email directly, but interesting to see your Triking project - looks lovely! And curious that your girlfriend has a V50 too! We're still working out how to transform it aesthetically.We're thinking of fitting a Ducati 750 Sport tank and seat (bevel era).

And I just popped into my local bearing shop and they had the 011 Viton seals you referenced on the shelf!! I was quite surprised that this certain well-known Dutch Ducati parts supplier sent the wrong ones - along with a couple of other oversights.

Anyway, I'll be in touch,

Kind Regards,

Greg