Athena Big Bore Kits - Yamaha Stock Item:BIG BORE KIT YAMAHA YZ450F 03-05.WR450F 03-06 480cc - (1x) Set of flush-mount

- (1x) Set of flush-mount self tapping screw hardware

Full coverage of the engine and frame rails

7 closable air inlets

outstanding reliability and state-of-the-art manufacturing techniques

Athena Big Bore Kits - Yamaha Stock Item:BIG BORE KIT YAMAHA YZ450F 03-05.WR450F 03-06 480cc - (1x) Set of flush-mountGet more power and torque with premium quality European big bore kits that include, cylinder, piston, rings, and all gaskets required for a hassle free conversion. Spare pistons, rings, and gaskets also available. Can't see your bike listed here, or the product you want is not in stock? Get in touch to see if there's a kit for your model and ask about price and availability.