Honda AQUATRAX R-12X 2005 Owner's Manual page 52

Controls & Features
The trim lever (1) can be locked.
To lock, pull the trim lever and push the trim
lock lever (2) forward.
To unlock the trim lever, pull the trim lock
lever.
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Instruments & Controls
LEFT HANDLEBAR
(1) trim lever
(2) trim lock lever
(1)
(2)