Ride it. As someone else mentioned, use a little less than full throttle. On most peds, once you reach top speed you can close the throttle until it looses just a little power. This will give you a more consistent mixture and much better gas mileage.
Check your wheels and tires for roundness by spinning them on the center stand and check your drive belt, if you have one, for lumpy travel. You might also check the chain for even travel. Turn the rear wheel by hand and watch the slack.