I'm one for easy maintenance, I still have a first year 01 YZ250F, basically all I do is change the oil and clean the air filter. Valves are checked at the end of the season. Plus I have my kids 50cc bikes, yikes. Now I'm looking at moving up to a 450.. 1) How easy it to change the oil and oil filter on the new KX450F? Does it take the same oil for the clutch and trans unlike the Honda? 2) How easy it to change the air filter? The bike looks like a Honda with the frame and the filter removal and install of the Honda filter compared to the YZ450 is night and day. So much room on the YZ450F. 3) Any valve issues yet? I know it's not been out long. Season runs March to November. With my YZ250F, I can get through the whole season without checking them and the bike still starts great. Thanks!