Honda BF35A-BF45A Outboard Motors Shop Manual., Page 410Get this manual

Honda BF35A-BF45A Outboard Motors Shop Manual., Page 410

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10) Remove the 2-way valve Remove the O-ring from the 2-way valve and discard itReplace the O-ring with new one during reassembly
[I] FREE PISTON

[4] DOWN RELIEF VALVE SEAT