If you have a fixed pitch prop then yes it will need a new prop and I would highly suggest a ground adjustable prop. I'm personally not much into fixed pitch props any more. They just seem limited.
Roger Lee LSRM-A & Rotax Instructor & Rotax IRC Tucson, AZ Ryan Airfield (KRYN) 520-349-7056 Cell
The original poster says "I get 5100 rpm on take off", then he says "I throttle back to 4000 rpm for cruise".
If he is getting 5100 rpm on take off, he will most likely get 5500 rpm or a little more in level flight wide open throttle.
To me the prop is pitched perfect.
Dale
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