Mercury Mariner Outboards 2.2 / 2.5 / 3.0 Service Shop Manual, Page 10Get this manual
MODELS 2.5-3.0 (1991 and later)
Throttle Lever Friction Adjustment
Turnthe screw attached to the throttle lever end To increase, turn screw clockwiseTo decrease, turn screw counterclockwise
Lift up on latches to remove cowlReplace cowl by engaging latches over top cowl latch recess
Cowl RemovalInstallation (Models 2.5-3.0 [1991 and later]) Throttle Lever Friction Adjustment
Steering Co-Pilot Adjustment