🛠️ Cylinder Works Big Bore Cylinder Kit – 99mm / +3.0 – 13.5:1 – Honda CRF450R/CRF450RX (2021–2024)

Upgrade your Honda CRF450R or CRF450RX with the Cylinder Works Big Bore Cylinder Kit. Designed for riders chasing serious performance gains, this kit increases displacement with a 99mm (+3.0mm) bore and a high 13.5:1 compression ratio. Engineered to look and install like OEM while delivering superior durability, this kit provides race-winning power without the need for machine work.

✅ What’s Included

• (1) Nickel silicon carbide plated cylinder (99.00mm / +3.0mm bore)

• (1) Vertex piston kit (high compression 13.5:1 piston, rings, pin, and clips)

• (1) Top end gasket kit (excludes valve stem seals)

📦 Fitment

• 2021 Honda CRF450R / CRF450RWE / CRF450RX

• 2022 Honda CRF450R / CRF450RWE / CRF450RX

• 2023 Honda CRF450R / CRF450RWE / CRF450RX

• 2024 Honda CRF450R / CRF450RWE / CRF450RX

🛡️ Warranty Info

• Backed by Cylinder Works manufacturer warranty

• Not legal for use in California (no race waiver available)

• For closed-course competition use only

🔑 Key Features

• Big Bore (+3.0mm) design for increased displacement and power gains

• High compression 13.5:1 Vertex piston kit for maximum performance

• Cylinder looks and installs like stock — no machining required

• Nickel silicon carbide plating ensures durability and longevity

• Complete top end solution with gaskets included (except valve stem seals)

• Replacement pistons, gaskets, and ring sets available for future rebuilds