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The motor should hit 5500 rpm at wide open throttle (WOT), with you and a light load.

Before testing a prop:

Take off the foil.
Ensure engine is mounted at least 2 holes up

Top engine bolt holes

0 <--bolt here is "all the way down"
0 <--bolt here is "1 hole up"
0 <--bolt here is "2 holes up"
0 <--bolt here is "3 holes up"

Check throttle cable at WOT position is hitting the stop and carbs are in correct positions.

On the water make two WOT runs at opposite directions and record WOT speed via GPS an the rpm's. Note wind, wave and weather conditions.

Report back.