Hi guys, I'm Joonil Park, and here's a video with shifting a motorcycle's gears without the clutch.
Now, the term power shifting, or shifting without the clutch, refers only to upshifts. Ask any qualified motorcycle technician, and they will tell you, downshifting without the clutch is very bad for your motorcycle's transmission.
Power shifting is accomplished by preloading upwards on the shifter. Do not move your shifter, just weight your foot against the bottom of the shifter, lifting up slightly without moving it. When riding steadily forward, quickly roll off the throttle. The cutting of the fueling will allow the gears to fall into the next higher gear, thereby enabling a power shift, or an upshift.
This is a more advanced technique, use it with discretion. It is used mostly in performance and competition to shave off lap times. However, if done properly, it can be a very rewarding and fun aspect of motorcycling.
So that again is steady throttle, preloading up on the shifter, rolling off and on, utilizing the cutting of the throttle to left the shifter move upwards into the next higher gear. Repeat as necessary, and enjoy.