23 cc / F-300
A friend of mine just set the same boat up this summer. Replaced an F-250 with an F-300. He says be careful, they are geared differently and that you will be over-propped with the 21". With the 17", he "spools up" to 5900 WOT, making 45 knots and cruses at 4,000 making 25 knots and attaining 2.3 MPG.
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