A larger sprocket doesn't give you any more power. It puts more torque to the rear wheel, giving you the feeling of more power. On the down side, it will raise your RPM's for street riding, and probably trash your gas mileage.
Replacing sprockets is easy, except for the countershaft sprocket. Those can be very difficult to break loose without an impact of some sort. Both sprockets and the chain should be replaced as a set, otherwise your chain will wear out faster. If you want to go up two teeth on the rear, get a chain two links longer, 4 teeth, 4 links, etc.
If you plan on doing a lot of wheelies, plan on replacing your $300 chain and sprockets a lot more often than the average rider, as wheelies put a lot of strain on the chain and transmission. You'll probably burn through clutches more often as well.
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