V FORCE 4 REED VALVE KIT BETA250RR 13-17 300RR 13-17 X TRAINER250 XTRAINER300 15-17 KTM250SX 03-16The VForce4 is built upon the solid foundation that made the VForce3 reed valve system such a success for over fifteen years. While the VForce3 has been continually refined over the years (including the latest VForce3R models), this is a complete redesign of the entire system. We jokingly say, "The only thing we didn't change is the bolt pattern." However this is actually quite true. All the components that go into making a VForce reed valve system