It takes very little effort to change the direction of a motorcycle.
Motorcycles steer via counter-steering (this behaviour is exhibited above 15 km/h, approximately). To initiate a turn, the rider and motorcycle must lean in the direction of the turn. This leaning is caused by turning the handlebars briefly in the opposite direction (counter-steering). All single-track vehicles (bicycles, scooters, motorcycles) make use of counter steering. Once the required lean is established to sustain the turn, the rider then steers into same direction as the turn.
NOTE: Please don’t push the handlebars with force. Apply very light pressure.
Take a look at the following videos:
The science behind counter steering
Counter steering demonstration