Honda FOURTRAX 2018 Owner's Manual page 108

Parking
Parking on a Steep Incline or a Loose or Slippery Surface
If you must park your ATV on a steep incline or loose or slippery
surface, use the following procedure:
1. While holding the brakes, set the parking brake.
2. Turn the ignition switch to OFF (w) and release the brakes.
3. If the ATV begins to move, either while sitting on it or after you
dismount, find a better parking location.
4. If rocks or other objects are available, you can block the wheels
as shown for additional security.
98 Basic Operation & Riding