Boyesen + Turbine Water pump cover kitRef : BOY00113A / 1118655

The BOYESEN water pump turbine (manufacturer part number WPI-44A) is a replacement component designed to optimize the cooling circuit of motocross machines. By increasing water flow and reducing hydraulic friction within the casing, it helps maintain a more stable engine temperature — a valuable asset when the pace picks up at the end of a race or during a long day of riding.

• Helps increase coolant flow for more effective thermal regulation.
• Reduces losses due to hydraulic friction to limit thermal stress.
• Promotes a more consistent engine temperature, useful in competitive conditions or intensive training.
• Contributes to reducing power loss at the end of a race and preserving the mechanics over time.

Designed for motocross environments, this turbine fits into the water pump housing and impeller category. It is suitable for recent 350 cc models, such as the KTM 350 SX-F (2025), the HUSQVARNA FC 350 (2025), and the GAS GAS MC 350 F (2023). Replace your worn impeller to restore a more responsive cooling circuit and thermal regulation suited to off-road demands.