Do a wheelie. [Preload] while doing the wheelie and release "Powerup". You will do a backflip without going off a jump.
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When going fast and are trying to turn, use the speed boost while turning. The bike will seem to jump forward.
Go to the freestyle level. Get your boost all the way up. Start going around the course to get speed. If you choose to use the loop as your take off, you need to boost all the way around it. Another good ramp to use is the one that is sort of under an elevated ramp; you will not need boost. To do many flips, choose your ramp and get speed. When you are about 20 feet away from the take off, hold [Analog-stick Down]. Keep it held and when you get to the peak of the take off, you will do many flips.
Use the following trick to do three or more flips on the ground. First, do a wheelie then keep it held. Hold [Preload] ([R]), and when it is full, release it. While holding "Analog-stick Back", you will do three or more flips.