I have been adding just under a pint of coolant after every ride lately and the morning weather here is a nice cool 60F so there is no real reason to be overheating. Even though I ride single track the most, we pretty much stay moving. The bike overheated once. I discovered that the waterpump seal went south and coolant was coming out of the weep hole for a couple of hours. Needless to say, I replaced the seals and shaft and added the Boyesen cover and impeller. I ride throughout the AZ blazing summer and every little bit of cooling improvement helps I guess. Anyway, my guess is that the head gasket is bad from overheating as this is when I (started paying attention to coolant levels much more closely) noticed the problem. I see no signs of coolant going out the overflow and the oil is clean. Cap seems fine and probably not the base gasket. Question: Is checking the head torque a waste of time or a good first step? Question: Is the 450 head prone to warping? I have 45 hours on the hour meter since I bought the bike used in March of 08. I checked the manual and it stated that I should inspect the piston every 1000km. Using our ride averages, this puts me at about 50 hours or so of engine time, plus the unknown love (or likely lack of love) that the previous two owners gave it. Question: Is a compression check (or any other check) valid or is it a maintenance item that simply gets replaced after 'X' amount of usage. Question: Parts needed: piston ass'y/rings/wrist pin/bearing, head gasket, base gasket...anything else to order in advance? Anything else I should look at while I'm in there? Ideally, a head bolt is loose and my compression is fine. I'm of the school that if it's not broken that it shouldn't be messed with. I have no idea though if that's appropriate for this machine. Any help would be appreciated.