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Your 90 hp Mercury outboard may be overheating due to several reasons, including a clogged water intake, a malfunctioning water pump, or a blocked cooling system. Additionally, low coolant levels or a faulty thermostat can contribute to overheating. It's important to check for any obstructions in the water intake and ensure that the water pump is functioning properly. Regular maintenance and inspections can help prevent these issues.

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3d ago

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