Cylinder Works 04-09/12-13 Yamaha YFZ 450 450cc +3mm Big Bore Cyl Kit 468-478cc 12.0:1 Comp 98mm

Cylinder Works is known for making well-built engine components that perform. This Big Bore Cylinder Kit is designed to give your Yamaha YFZ 450 a significant power boost. It increases the engine's displacement from its stock 450cc up to a range of 468-478cc, which translates directly into more horsepower and torque. If you're looking to get more out of your ATV for racing or serious trail riding, this kit is a solid way to achieve that.

What makes this kit stand out is the attention to detail and the included components. You get a hand-matched Vertex piston, which is crucial for proper fit and performance. The kit also includes a complete top-end gasket set with O-rings, so you have everything you need to get the job done without hunting for extra parts. The cylinder itself is constructed from a high-quality 2618 aluminum alloy. This material is chosen for its strength and durability, which is essential for handling the increased stresses of a bigger displacement engine. The compression ratio is set at 12.0:1, which is a good balance for improved performance while still being manageable with proper tuning.

This kit is designed to look like an OEM cylinder but perform like a race-ready component. It's an all-in-one solution that offers cost savings compared to buying each part separately from the manufacturer. When installing, be sure to follow the manufacturer's recommended procedures for piston ring gap, break-in, and tuning to get the most out of this upgrade.