Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 89Get this manual
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HONDA BFSOAmS5A
7) After installing the timing belt, check each mark for proper
alignment
[41 TIMING PULLEY
8) Install the 34 mm lock nut (P6-6)TOOL: Crankshaft holder 07923-ZA