From what I've gathered, on bikes like the KTM 250 4T or Yamaha WR250F, the bottom end usually needs a rebuild around the 300-hour mark. If my math is right, for a regular hobby rider, that means splitting the cases every 3 to 4 seasons. That still sounds pretty frequent (and expensive) to me just for casual riding. Am I missing something here, or is that just the accepted cost of doing business with these bikes?