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The tilt / trim unit on the Yamaha 90, is a self contained, sealed unit. It is designed to be self bleeding, by running the unit to full up, from full down position, through several cycles. Make sure that the unit is full of fluid before, and during, the bleeding process. Also, give the trim motor a rest after each couple of cycles, this time given the motor to cool down, will also give time for the air bubbles to settle out of the trim fluid. The unit will usually self bleed during normal usage while you operate your boat.

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15y ago
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Q: How do you bleed air out of power trim on a 1997 90hp Yamaha outboard?
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