133 might be just a little optimistic, hard to get an XCR to go that fast, and they have 20hp over the XC......
I would agree with the power valves. You'll want to make sure they've been changed out to the stainless upgrade to prevent potential warping/breakage. Breakage can result in a grenaded motor - but honestly doesn't happen that often in the grand scheme of things.
Keeping them clean is part of normal maintenance with a VES 800. If the valve gets too much crud on it, it can't open, or gets sticky causing loss of RPM. If left in this condition, it can result in the valve melting, potentially causing damage to the motor.
Valves not that hard to stay on top of. The performance of this motor is worth the trouble....
Left front motor mounts are usually an issue when ridden by anyone riding even semi agressive. SLP make a torque arm (less than 100.) a lot of guys are using to eliminate that problem.
Betting, even with the issues you may run in to, you're going to love it.
'07 Apex RTX w/Pro X suspension conversion, Fox Floats w/resi's, Doo extro drivers, Cobra track, Dual Ryde FX rear clickers, .375 Edge torsion springs, HyGear Dual rate front skid springs, SLP anti-stab kit, Powermadd handguards/mirrors, 2" Rox riser, shimmed Poo skis w/custom (homemade) ski savers, Black chrome W/S, Graphics by Arctic FX, and a grin every time I think about it! New Project: 600HO Fusion bump sled, Air 2.0 w/hi/low valves, HRM spindles, Retro graphics, .359 torsion springs.