Accelerate while doing a wheelie, and press either down or d key to charge a boost. Your will be able to still drive at full speed while charging a boost. Note: This tech works in the games: "Moto X3M", "Moto X3M Winter", "Moto X3M Pool Party", "Moto X3M Spooky Land", "Moto X3M 2", and "Moto X3M 3".