Those arent shorter than the YFZ450 yammerhammers. Those are almost so short that they want to almost spinn in the bores. Thats why heavy raced 450's get rebuilt every 50-70 hrs of run time. Pro guys are doing it every race. Its crazy, but light and they freekin scream!!
Those are PIRDY , What kind of rods are they, Lentz, or Corillo??
