I would try a 14x19 or 14x20, the 15 inch prop is too much for the 140 to turn on this size boat.
Its not as much a question of more speed, its that you are putting a lot of strain on your motor and it will wear out much quicker, or just fail.
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Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke.
1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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