03 CR 250 with a steel sleeve (don't ask). It has about 19 hours on it since I did the jug, new piston and rings. Factory service manual says 7.5 hours to replace the piston and rings if you are racing... While I don't race, I have been to the dunes but about 80% of the riding has been trail riding. Is there any factory service recommendations for riding outside of racing? Thanks.