I repowered my 1975 18' SC last summer with a Suzuki DF90 and couldn't be happier. With the factory stainless prop (14x16) it planes at about 12-13 mph, which, for me, is 3500 rpm. It tops out at around 35. I think it has more than enough mid range torque, which comes in handy running a sloppy inlet. I struggle to stuff five gallons of gas into the tank after a day of fishing. I think it's a great motor.
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