sorry forgot yours was a 18. the 20 is rated for 175. if you got to 47... 50 is possible fresh wax on bottom, trim, motor height, etc.. the trade off for top end is not always worth it. I thought the motors were rated at the prop in real world HP. 150 =150 at the prop shaft 175=175 at the prop shaft.. if and when i can swing the new motor i will be extatic with 4 + mpg @ 35 mph..
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