I wonder if you guys can help me slap some sense into an old friend of mine. This friend, who we can call.... Hillbilly, has a 2007 YZ 450, which he has had for well over a year. Now, I am aware that Yamahas are known for durability and reliability, but there are some things that just have to be done to keep a bike running properly. Hillbilly races a full schedule, probably 12 races or so a year, and rides at least once a week, if not more, from March through October. Here is where I need your help, as ridiculous as this may sound, he insists that since the bike is a Yamaha, is so reliable, and tough as a rock, that he never has to change his oil, clean his air filter, check his valves clearances, wash it, or perform any other maintenance, and the bike will continue to perform at it's peak. I will give him some credit though, he did change the piston, while performing his annual valve clearance check over the winter. I would say, that since he has owned the bike, he has probably changed the oil and cleaned the air filter, no more than six or seven times. He has checked the valves once, and probably only washed it a handful of times, at most. I ride a KX 450, which does not have the YZF's reliable reputation, and even though I don't really race, I maintain the hell out of my bike to keep it running well, and catch nothing but grief from him for doing so, he tells me I am wasting my time. If you YZF riders could be so kind as to post your thoughts, so I can show him this thread, and hopefully knock some sense into his Hillbilly head. Please note, there is no need to be polite in your replies, as the only advice that will sink into his head is that which is blunt, and to the point. If I am wrong here, please let me know, but I really don’t feel like telling him, "told ya so," when his bike has blown up, and he is pushing it back to his truck. Thank you in advance, and I apologize for the long and windy post.