I was just wondering how often i should replace my timing chain and piston. I dont really race and i clean oil every 3-4 rides and airfilter everyride. The timing chain is 20 or so bucks but last i checked my valves and chain the chain seemed the same tight as new. i have heard to replace every year or so but i dont want to if i dont have to. i have 30 or so hrs on the bike and plan on replacing the piston long from now and the timing chain next year. Do you think this is reasonable?