Free Bike
To get any bike without using your money go to two player mode and choose the bike you want. Then simply put the game on one player mode and start the game. You will have the bike you picked.
Fast Bikes, Loose Cash, And Level 5
At the password screen, enter "r7ef-tu0r" for $250,000 and a fast bike on level five.
Fast Bikes And Loose Cash
For a hot time on a hot bike, go to the password screen and set the fourth digit to '2' and the sixth digit to 'U'.
Cheaper Repair Cost
During the game when your bike has no more hp DO NOT go back to your bike and let it wreck when you touch it. Instead start jogging up the road. After a while a police officer (like OFFICER 11 etc...) on a bike will come up and arrest you. You will still have to pay the ticket, but when you start the race again your bike will be as good as new. Note: If you do so you will discover that paying the ticket is a lot cheaper then paying the repair cost.
Easy Money
To start on level 5 with $45,000, enter the password "SPU1 5903".
200000 dollars
Go to password select, enter 15S9 pu03.