Well, I am not sure if my 400 has ever has it's valves checked (Estimated 60 original hrs on bike). Yet it still starts first kick, and runs flawlessly. I am checking the valves, and in the manual, it says to drain the coolant, and take off the rads for more room. Is this nesscesary? I really don't think it is, and I don't wan't to go out and get more coolant.