I had a 2003 DF140. These were my numbers on an 84 cuddy, 25" transom, with a hard top and enclosure.
3 blade 14x20 Suzuki prop
Cruises 30 mph @ ~3.5mpg
Top speed ~36mph heavy ...~39 mph very light
I ran in the ocean where going faster than 30mph in a 2000 pound boat was not possible very often anyways. I loved that motor.
Personally, I think it was the perfect motor for the price and weight.
Now I have brand new twin DF200APs on my Grady265. They are huge compared to a DF140. They are awesome motors.
I don't think I would put 20" motors on anything unless it was a lake boat.
I would look at this as an oppurtunity to replace the transom to a 25". Get the piece of mind knowing the transom is good before putting a $20k 200hp motor on it.
btw, I hear that they are coming out with DF140APs with fly by wire, digital gauges.
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