???
I got fresh valve oil seals from yamaha and they fit like athena seals.
They move up and down with the valve??
The old ones fitted tight and didnt move up and down.

Are they meant to move? did they change the design?
Do I need a special tool to clamp them down??

Normaly you must tighten the Valve seal "without" Oil on in, on the valve-support, and then it will be ok.
You must have a little bit counterforce, when you put in on the valve-support.
In the valve-support is a natch, wich will hold the valve-oil-seal.
the valve-oil-seal will be the same, on all XV Engines! form 700-1100 ccm!
when you put in the valve, give same oil on it....

greeting from the Eifel

Klaus

Right-side!

I've found out why the seals didnt fit.
I dissasembeld my 2nd parts motorcycle and found it looked differently.
The place where my seal fit was machined.
I'll upload foto's later.
Is costum seals an option?

The valve guides shown on your picture are not the origin  guides, and they don´t look good , you can replace them, but that´s not cheap, and you better ask someone who knows how to do this job correctly. 4 original guides are about 200 Euro, i presume. Sorry for not having better news,
Ali