Accellerate rather swiftly through the lower gears. Its fun. About 30MPH in first, 50MPH in second. The bikes (at least mine) have a rev limiter so you can't over-rev the motor. Try to find what speed yours hits the limit (depends on the chain sprockets on your bike). Then just shift before you hit the limit. I usually don't get anywhere near the limit on the higher gears.
