See full version: Gas Consumption of older 2 vs 4 stroke engines
I'm in the process of buying a used 19 to 22 ft. deck boat with an outboard in the 115--150 HP range for MN lakes. (the boats range in dry weight without motor from about 1500 lbs to 2300 lbs). My budget allows me to buy something in the 1997-2002 range.
Re: Gas Consumption of older 2 vs 4 stroke engines. [links]
The advertised numbers for a Yamaha F200 on my boat at 4500 RPM is 32.2 MPH, 9.8 GPH, 3.3 MPG
http://www.gradywhite.com/228/performance_data/1/F200
I have inherited my late fathers Shetland 2+2 boat (the one with a proper v hull) and am recommissioning her. As the transom was rotten I have had this replaced, and owing to water sitting in the transom well and the exhaust port being submerged, opted to have this made to 24 inches (extra long) - should have been 25" but thats another story.
The outboard is a Mercury 125hp 2 stroke from 1999 (bought new at Soton boat show), as it only ran for 50 hours and was then winterized she is according to the "mechanic as new" (albeit a 1970s design 2 of the cylinders cut out below 1,800 revs), she has not been run up yet as some Gypos tried to rob the engine. I have been told a leg extension from 20 to 25 inches is around £2k, plus other unknown costs, budgeting £2.5k. [links]
Question boils down to how much fuel will I use in a season (assume 100hrs coastal) weighed against the cost of buying a new unit - looking at a cancelled order for an xl 115hp optimax which comes with a 5 yr warranty, in the low £7k region (less whatever I get for the old o/b). How much less fuel would an Optimax use by comparison - some say half but that must be an exaggeration?
Suzuki's 2.5hp model DF2.5S3 outboard motor is a perfect choice for square stern canoes, small tenders and inflatables as well as other small craft. At only 29 lbs, it's the lightest 4-stroke Suzuki outboard ever built.
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