S90: Valve Compressor Tool

Getting the valve out was actually somewhat anti-climactic.  Turned out to be a lot easier than I was expecting.  Hardest thing was getting the keepers lined up when I was re-installing the valve, but just another of those little things that probably get easier each time you do it.

Here's the 19mm bit (the tool comes with 5 sizes) sitting on the valve spring collar as I begin to compress it.

After removing the keepers and collar, the inner and outer springs can be removed.

 Some shots of the valve itself.