20 July 2016 Last updated at 19:08 BST
The crash happened near Mila's Lake in Colin Glen Forest Park on Tuesday evening.  Two youths, aged 15 and 17, have been arrested.
Community safety worker Michael George said there had been a number of initiatives in west Belfast to tackle the issue of scrambler motorcycles.
A community worker has said scrambler motorcycles are a problem in west Belfast, as a woman remains in a critical condition after a collision.