Stick Man And Bike
In Enduro, do not edit your bike then choose a level. You will end up as a stange man with a bike made of sticks. (this will not work all the time.)
Blast Of A Mountian
Go to the very edge of the playing field and
drive up the side of it and when you get to the
top keep driving strait and you'll be balsted of
the mountain far over the screen.
Backflips And 360s
To do a backflip go to a practice session in
freetyle mode. Use a 500cc bike and get on top
of a large cliff. Hold in tab, the clutch
button and down. Release tab and clutch and you
will do a backflip. Takes a few trys and once you
get used to it you can do it without tab. To do a 360, go off of a decently sized jump. While in air hold left and the brake. This can also be done turning right but it takes more effort and experience.