[ursa minor]

Damage to the prop can affect performance. Dings or chips on the blades can make quite a difference in performance. You need to find out what pitch and diameter you have now if you're considering a replacement, that's typically stamped on the hub of the prop. You also need to know what the recommended RPM range on your engine is at wide open throttle. Its really important to reach the recommended range, otherwise you risk overloading the engine if you have too much pitch. Assuming that your existing propeller is original, the pitch you have now would be the place to start.