I am about ready to pull the trigger on a 2002 400MXC. My question is... how often do/did you adjust the valves? When I was probing the current owner about the last time he checked them, he said "never. The Previous owner told me you do it when it won't start and it starts with one tap of the button every time so I haven't done anything with them." This is making me a little nervous but I don't know much about these motors... or any KTM motors for that matter. So I don't know if this is reasonable or if this should be a warning sign that the two previous owners didn't do a "regular interval" valve check. Your thoughts? He does seem to do fluid changes regularly. Said he bought a multi-pack of oil filters and has two left that he'd give to me with the bike. He's owned it for a year.