Race proven worldwide by Team Hondas & Team Suzuki World MX on their World MX Championship RM250 & RMZ450 Improves heat dissipation Stronger than stock CR250 Cover increases oil capacity in transmission from 650cc to 800cc and directs oil back in clutch, both features greatly increasing heat dissipation Precision machined from billet T-6 aircraft quality aluminum to aerospace tolerances This product can be used with Yamaha YFZ450 04-06