To unlock these cheats enter the code at the code screen:
Effect: Code
Cheat Mode: SOMONEY
All Bikes: FACTORY
All Characters: FULLHOUS
No Bike: sqatter
Unlimited Boost: lazyridr
All Outfits: hookedup
All tracks: buspass
Moon Gravity: ftail
Flaming Bike: firesale
Slow Motion: wtchkprs
All Riders: populate
High Jump Contests
When you are doing any of the high jump contests, preload (lean forward then backwards), immediately before you are about to jump. It may require a few attempts to land in the middle of the white lines, but it will help you reach your goal.