I recently bought myself a 2007 Yamaha YZ450F about 2 weeks ago. I've had bikes in the past but this is the biggest bike I've had and the first one I've bought with my own money and am soley responsible for it's maintenance. I am the third owner of the bike and believe the bike was once raced since it has some guys name on it and racing numbers on it. I'm not sure if it has any aftermarket parts on it. The bike seems to have been well taken care of it always starts within the first few kicks and hasn't gave me any problems yet. I've rode it about 8 total hours. 2 hours one ride, 4 hours one ride, and 2 hours on another ride. I'm hoping someone can fill me on some general maintenance tips to keep my bike running in tip top shape. Any educated and experienced responses will be appreciated!