I have an 05 RMZ 450. Its got around 10 hours on it and all of the suggested maintenance (oil changes, timing chain tension, etc) has been done. Everything is great, so far, but my big worry are the two oil strainers in the bottom of the case. These strainers are in the oil drainback circut and if plugged will stop oil flow to the oil pump and destroy the motor. The manual suggests that they be checked and cleaned every 12 hours. To get to the strainers the cases to be split, which is a crazy design to me. Now the big question- is anybody doing this? I know the manual can be a little over cautious sometimes, after all who replaces the piston after 12 hours as suggested.
The only reason that this worries me is because the parts guy at the dealership told me about a bike that came back after 20 hours. The strainers were plugged and the motor was locked up. Who knows though, the bike may not have been maintained and the oil may have never been changed.
I am running synthetic oil to help prevent oil breakdown and particle build up and will change oil and filter every 6 hrs. Unless I hear any more horror stories I guess I will cross my fingers and hope for the best.
If anyone else knows anything, please let me know.