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Cross-check your original part number against 6DA-12411-00 or 6DA-12411-01
suitable for most boats up to 200 HP
and BF90 series
oil filters should be replaced at every oil change—usually every 100 hours of operation or annually
Remove the old thermostat
Thermostat Cover Gasket – Fits Mercury Marine 200-300 HP Outboard Motors (Replaces 27-850318, 27-8503181) family-yamaha-f150txr Cross-check your original part numberThermostat Cover Gasket Fits Mercury Marine 200 300 HP Outboard Motors (Replaces 27 850318, 27 8503181) This thermostat cover gasket is designed for a precise fit on Mercury Marine 200 300 HP 3. 0L and 2. 5L V6 outboard engines, as well as 250 HP SportJet DFI Jet Drives. It ensures a reliable seal for the thermostat housing, preventing coolant leaks and maintaining optimal engine operating temperature. It serves as a direct replacement for several OEM