Boyesen WPK-38DM Magnesium Water Pump Cover and Impeller Kit for Yamaha YZ450F and YZ450FX

Upgrade the cooling system on your Yamaha with the Boyesen WPK-38DM Magnesium Water Pump Cover and Impeller Kit. Designed for off-road performance, this kit combines a durable two-piece cast aluminum construction with a patented Nautilus-style impeller to promote efficient coolant circulation across the engine's operating range. The result is dependable cooling performance for demanding riding conditions.

The Boyesen WPK-38DM kit also provides convenient oil filter access, making routine filter changes easier and reducing service time. Its hydrodynamic impeller design supports increased coolant flow at all RPM ranges, helping maintain consistent engine temperatures during aggressive riding, racing, and extended trail use. The magnesium-finish pump cover and precision-engineered impeller provide a performance-focused replacement for the original water pump components.

Manufacturer part number: WPK-38DM. Vendor part number: WPK-38DM. This Boyesen water pump cover and impeller kit fits the 2023 Yamaha YZ450F, 2024 Yamaha YZ450F, 2024 Yamaha YZ450FX, 2025 Yamaha YZ450F, and 2025 Yamaha YZ450FX. Confirm the motorcycle model and year before installation to ensure proper fitment.

Features:

• Construction: Two-piece cast aluminum design provides durable performance in demanding riding environments
• Service Access: Oil filter access allows convenient, hassle-free filter changes
• Coolant Flow: Increases coolant circulation across all engine RPM ranges
• Impeller Design: Patented Nautilus-style impeller promotes hydrodynamic efficiency
• Fitment: Fits 2023-2025 Yamaha YZ450F and 2024-2025 Yamaha YZ450FX models