Honda BF20 BF2A Outboard Motors Manual, Page 11Get this manual

Honda BF20 BF2A Outboard Motors Manual, Page 11

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BFSO-BFSA
Blown head gasketImproperly tightened cylinder headPoor valve seat contactWorn cylinder, piston or piston ringsCylinder head warpageLess tappet clearanceImproper valve timing
CYL