Honda BF20A-BF25A, BF25D-BF30D Outboard Motors Shop Manual., Page 110Get this manual
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HONDA 6FEOAmESA
ROCKER ARM I.DMeasure the I.Dof the rocker armSTANDARD 13.000- 13.01 rnm (0.51 18-0.5125 in) SERVICE LIMIT 13.04 mm (0.513 in)
Replace the rocker arms iftheir I.Dis