I am looking to upgrade from a crf230 to the 150R expert and would love to turn this thing into a woods weapon. (yes I'm short so I will fit) However I ride everyday rain or shine and have put about 2500km's on my CRF in 3 months. Therefore I need to know how many hours/km's honda recommends before new piston or rings and a top end refresh are needed. Why did they stop making the XR250/400's??