ok first of all find a ramp that aint big and spawn the quad
(LEFT,LEFT,DOWN,DOWN,UP,UP,SQUARE,CIRCLE,TRIANGLE,R1,R2)
then go full speed at the jump and as soon as you jump the ramp hold down on th jeft anolog stick and CJ will pull a sick backflip
great for home movies for a gta website
PEACE~HOMIES
DONT MESS WITH THE MAN