A 90 does it justice. On plane fast with a old Mach 4 blade prop, ran the boat to near 40 WOT. 70 seems a little lacking in a 4-stroke I would think. But that 70 Yamaha is a sweet little package.
Yamaha 115 2-stroke is what I wet tested on the hull before I bought one. No regrets, I went used 90 hp Johnson on a new boat. It got me on the water, this time I am going to pony up. Literally. I think a 115 4-stroke is what it needs. I should be able to put it on plane and make fuel at 3500 RPM -- close to 7MPG cruising.. Stoked because the ole 2-smoke does not get 2 MPG I kid you knot...
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1996 -19' NV Flats 115 Mercury 4-stroke
1983 -20' Wellcraft Center Console 250 XS
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