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Does anyone have any experience with the YEP-842? It seems like the tolerance is very tight on my horn. Even after applying valve oil and I spin the valve around in it's casing it feels like it is rubbing up again it. The valves are also rather noisy. Has anyone else had a similar experience?

Looks like I had my instrument cleaned this way about 2yrs ago and used very lightly since then. Could this be why?

All good advice from Joe. Yamaha is well known for tight valves - it's one of the things that helps them to play so well.

It will need a very thin high quality oil. If this doesn't work then you should contact a Yamaha rep to see if they'd be willing to lap the valves a bit (assuming it's always been this way).