I often hear about how much less maintenence there is to a 2 stroke, than a 4, mostly from guys on 2 strokes. However the 2 stroke guys like to change the piston and ring after about a year of riding, or 250 hours. It takes about an hour and a half to do that. Costs aprox $150. I am going to have my valves checked in my 07 WR450 once a year. Last year they were all well within spec, so no money was spent on parts. It didn't take me any time. I paid the dealer to do it, and it cost a lot less than $150. So, it seems to be a "top end job" vs a valve check. We change our oil a lot more, but they mix gas. What am I missing? How is the 2 stroke less maintenence?