Add any sound you want to your electric motorcycle with some portable speakers and an MP3 player!
Step 1: Download MP3s
Download some fun sound effects from the internet, use a sound effects CD, or go out and record your own.
Just get some sound into your computer and then into your MP3 player.
Suggested sounds would be those of a motorcycle, but why not a Jetsons car sound, The Electric Slide, or the Back to the Future theme song?