Through extensive development, with flow bench, dyno, and track testing, we achieved optimum power from our GYTR ported cylinder head. Once we perfected the head flow characteristics, we meticulously digitized the ports to obtain the precise dimensions needed for CNC machining, Unlike flow variations inherent in hand porting, CNC porting lets us accurately reproduce this maximized flow design with every cylinder head manufactured. Cylinder head comes as a ready-to-install assembly, with valve train and GYTR Performance Camshafts pre-assembled. Can be used with stock or GYTR performance piston. (GYT-5D305-00-00), sold separately.

This accessory is restricted to closed-course competition only. (All YFZ450X and YFZ450R models are regulated by the EPA. Because this accessory affects emissions, using it constitutes illegal tampering punishable by law unless the vehicle is only used in closed-course competition).

*NOTE: For maximum performance and protection, always use Yamalube® 15W-30 Full Synthetic Oil after installation - two quarts are included with each GYTR Ported Cylinder Head Assembly.