Cylinder Works - Yamaha WR450F '07-'15, YZ450F '06-'09, YFZ450R '09-'18 Aviator Ace The HG1 Evo WP replaces

The HG1 Evo WP replaces its predecessor

No fuel management modifications are required to obtain increased performance

Base Inside Diameter: 2

Sipes in the radial TrailRiders are small cuts that create extra grooves

Air Filter Material: Cotton Gauze

Cylinder Works - Yamaha WR450F '07-'15, YZ450F '06-'09, YFZ450R '09-'18 Aviator Ace The HG1 Evo WP replacesA Cylinder Works replacement cylinder is a completely new, not remanufactured, cast aluminium nickel silicon carbide (NSC) electroplated stock bore cylinder that appears just like an OE cylinder. NSC is a composite of nickel and silicon carbide, providing an excellent wear resistant surface with oil retention capabilities. Cylinders are then diamond honed to the exact bore dimension and proper surface finish to ensure the proper ring seal and oil