I didn't realize this was on that big of a boat, that changes things a bit. I would definately say look for an mid year 03+ if you go with a DFI EVINRUDE, just make sure it was one built by BRP and not an OMC leftover. That 200 has got to be working it's tail off to keep that boat up on plane. A set of 225 carbs and a MIRAGE PLUS or APOLLO from MICHIGAN WHEEL will do ALOT of good for that rig. You need to be swingin as big a prop as you can on that boat, and I would think a 15 pitch would be just about ideal for it in a MIRAGE PLUS. And a set of 225 carbs will definately make a noticeable difference. Keep the timing at 18 and no more though for that boat, it's to heavy and will cause detonation if you go even a little over. I persoanlly would look for an 04 250 EVINRUDE if you can find one. And also that 99 wouldn't be a good match to that boat as the heavy boats is what caused most of the failures in the smaller 3.0L FICHT's. In 01 they went to the 3.3L big block for the 200-250 like they had in the late 90's for the 250 carb motors. They have ALOT of torque which is what you want for a boat like that.
Now that I see what boat your working with I would guess your fuel burn numbers to around 15-17 GPH at 4400-4500 RPM's. that is just about the norm for that engine on a heavy hull. 225 carbs will keep you at roughly the same fuel burn but with a slight jump in HP which means you can swing a bigger prop and lower your cruise RPM's. And don't forget your prop. Any engine be it carb, 4 stroke or DFI won't get good milage unless you have the right style prop for the hull.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR
2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD
AND THE PINK JEEP!!!! R.I.P.
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