Call me lazy, but do we really have to do all of the rutine maintenance called for in the manual. i have a cdn. 01 wr426, and i haven't done any engine work on it since new, or about 2500 miles (aside from the regular oil and filter changes, valve clearance checks and some jetting work on the carb) i am just kind of thinking of doing the top end over the winter and maybe replacing the piston and rings. i was just wandering if is necessary to do the top end or should i just leave it alone as it is running great! also has anyone done their top end and found anything wrong with it? thanx. matt.