Determine the manufacturer's maximum rpm range.
It should be in the owner's manual or placarded on the motor.
Load boat with typical weight you expect to carry and full fuel.
In a perfect world with a perfectly pitched prop, you should hit about the middle of the rpm range.
Be aware that with a lighter load, you will get higher rpms. Don't over rev it!
One inch of increase prop pitch will decrease the rpms by about 200.
Changing the prop diameter and number of blades can affect the max rpm as well.
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