Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 116Get this manual

Mercury Mariner 4 and 5HP 4-Stroke Outboards Service Shop Manual 1999, Page 116

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CYLINDER HEAD
Desired Results To achieve uniform valve seat width

ConditionValve seat is too narrow and it is near valve margin

Valve Seat Cutter Set Use 15 Cutter, Fir