Thermostat Cover Gasket – Fits Yamaha 75–225 HP 2-Stroke Outboards (Replaces 688-12414-A1/00) family-yamaha-9-9elhp especially on startup or when

especially on startup or when turning the steering wheel

Hand-tighten all mounting bolts in a star or cross pattern to ensure even alignment

Disconnect Linkages: Carefully disconnect the throttle and choke linkages

or if visibility of the internal filter element is obscured

Direct fit for Mercury Mariner 2-stroke 3-cylinder engines

Thermostat Cover Gasket – Fits Yamaha 75–225 HP 2-Stroke Outboards (Replaces 688-12414-A1/00) family-yamaha-9-9elhp especially on startup or whenThermostat Cover Gasket Fits Yamaha 75225 HP 2 Stroke Outboards This thermostat cover gasket is a direct replacement for a wide range of Yamaha 2 stroke outboard engines from 75 HP to 225 HP, including models from the SX150, S150, and two stroke HPDI series. It provides a reliable seal for the thermostat housing to the engine block, preventing coolant leaks and ensuring proper engine operating temperature. This part replaces original Yamaha part