Yamaha 688-44352-03-00 Outboard Waverunner Impeller

The Yamaha 688-44352-03-00 is a genuine OEM water pump impeller designed for Yamaha Waverunner and sterndrive marine outboard applications. The water pump impeller is a safety-critical cooling system component: its rotation draws raw water through the pump housing to cool the powerhead, and its degradation — through rubber hardening, blade cracking, or debris damage — is the leading cause of preventable outboard engine overheating. Using a genuine OEM part ensures that blade count, diameter, rubber compound specification, and shaft bore tolerance are manufactured to Yamaha's validated engineering parameters, not approximated to a close-enough standard.

Part number 688-44352-03-00 must be verified against your specific engine model, serial number range, and year using the Yamaha parts lookup system or service manual before installation — impeller specifications are not universal across Yamaha's engine lineup, and confirming compatibility is the first step in the replacement procedure. Installation follows the water pump service procedure in the applicable Yamaha service manual, which specifies housing inspection criteria, torque values, and reassembly sequence. Yamaha's recommended replacement interval is annual or every 100 hours, whichever occurs first. For a component whose failure can cause catastrophic powerhead damage, adherence to OEM specification and service interval is the minimum standard for responsible engine maintenance.