1984-1986 Mercury Force 4HP Outboards Service Manual, Page 64Get this manual

1984-1986 Mercury Force 4HP Outboards Service Manual, Page 64

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5 Check shift pin and shift cam for wearShift cam will wear on face Figure 18 7 Inspect gears lor wearMeasure bearing nner diameter Figure 21
Excessive wear on crests may allow motor to drop out