Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 251Get this manual

Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 251

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From P2-15 Stop the engine and check the water intake screen for cloggingIs the water intake screen clogged? Yes Remove the blockage
Replace the thermostat (P9-11)
1 Disconnect the ECT sen