Posts: 295
Location: Southern Ontario, Detroit River and Lake StClair | With out actually being there and seeing how thing are set up and running the boat its hard to tell 100% but I'm going to go with your over propped. I've set up up a few boats in the 18' range with 150's on them and pretty much eveyone ran best with a 19p prop. The odd one with a 17p but never one with a 21p. There are a lot of variables though. 4200rpm sounds way low even with a 21p on it. Try Steves suggestion about playing with trim first. Get up on plane with the trim set at 1/3 run at that and see what max speed and RPM are, then trim up till you stop gaining speed or the prop starts to slip and note the speed and RPM there. Make sure its really trimming up also. Check the gauge and have someone watch the motor. Let us know how you make out.
Good Fishin'
Tim
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