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    Yamaha 4 stroke 90hp oil leak in lower unit

    Just sharing how this issue was resolved. I had a mechanic check the motor. He diagnosed the motor running hot. The oil blowback was due to the motor running hot. Mechanic ran the motor without thermostat which fixed the overheating issue. After running motor for more than 20 minutes there is no...
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    Yamaha 4 stroke 90hp oil leak in lower unit

    We pulled out the lower unit today. We kinda saw where the leak is coming from. Maybe I over filled the oil?
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    Yamaha 4 stroke 90hp oil leak in lower unit

    Hello. First time boat owner. Got a 2003 90hp yamaha 4 stroke. I changed the oil and gear oil recently. Now when I come back from fishing I will get this oil dripping from the lower unit. When I changed the oil I did not properly place a.drain pan and oil went to the lower unit. Do you think...
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