Various cheats
     Type in where it says "Name" on the single race screen.

Code                    Result
!Scooter!               You ride a scooter, wearing a suit.
Ghostriders             You become a ghost.
BeamTeam                New bikes.
RedJocks                Ride in your underwear.
!Maate!                 Get Doohan's NSR '94 #4
!Junior!                Unknown