Honda BF135A, BF150A Outboard Motors Shop Manual., Page 391Get this manual

Honda BF135A, BF150A Outboard Motors Shop Manual., Page 391

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BF135ABF150A VTEC ROCKER ARMROCKER ARM INSPECTION
INOTICEI
Remove the pistons from the primary rocker arm by applying low air pressure to the rocker armTake care not to apply excessive air