Honda BF15D BF20D Outboard Motors Shop Manual., Page 160Get this manual

Honda BF15D BF20D Outboard Motors Shop Manual., Page 160

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1) Disconnect the spark plug caps and remove the spark
[3] 30 mm LOCK NUT
69 N-rn (7.0 kgf-m, 51 lbf-ft)

timing belt drive pulley and guide plates in the direction shown6) App