Love excitebike!!!!
Youtube excitebike for some crazy fast runs and utilize a little glitch in the game. You basically press forward throughout the whole map. When you are coming down from a jump, right before your front tire hits the ground or an object, quickly press back and then forward again (on the D-pad) which will make it so you don't crash. If everything goes right, you'll get going faster and faster until the screen is like a blur and you lose sound. You can go so fast and jump so high that you come up through the bottom of the screen.
A good way to test this is to make a custom map with nothing other than spaced out jumps and a lot of those things that keep your bike from over heating.