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So my Yamaha f150 2016 with 800hr started to make bubbles and vibrations from its lower part. My mechanic inspected the motor, we changed thermostat that he suspected and it is the same. It makes alot of bubbles from the lower part and vibrations in neutral and water goes out through the exhaust system on the upper part. When its trimmed up little water stops coming from the air exhaust system. He suspects that sea eat some part in the lower part of the motor. He putted the motor through analytics and temperatures and everything works fine. Did anyone had something similar. Thanks.