Mercury 9.9 EH Manual page 86

9.9, 15, 18, EH Models
a - Reverse (R)
1. Forward: Turn the throttle grip to reduce engine speed. When
the engine reaches trolling speed, quickly pull the shift lever
to the Forward position.
2. Reverse: As when shifting to Forward, reduce the engine
speed, when the engine reaches trolling speed, quickly push
the shift lever to the Reverse position.
OPERATION
a
b
b -
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Forward (F)