First let me apologize for my ignorance on this subject... I just bought an 02 426 and love the bike. I have been away from the dirt bike scene for a long time and forgot how much maintenance you need to do on these bikes. I read through the maintenance intervals and it seems like I will spend more time working on the bike than riding it. As a kid all I did to my bikes were change the oil and clean the filter, change the spark plgs and lube pivot points. Now I read how the valves need to be checked every 3 rides and take the engine apart every five rides for the cams, pistons and cylinder head. What really needs to be done in this area and how would you define 3 to 5 rides. Assuming I am going to the track 2x's a week and riding(not racing) for 2-3 hours. Do I really need to be taking the engine apart every week and a half? Thanks in advance for your help.