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  1. #1
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    99 225 optimax dfi

    i just purchased a 99 opti dfi (boy the oil use is unreal) i been playing with merc all my life i dove into this one because it had less then 100 hours on it original and got a great deal.
    Here is my issues as i begin to run it on my boat it has no where near the power or fuel mileage of my efi. I can barley turn the same prop. is there any simply mods that i can do. pocketbook is limited but as far as mechanical i can mod out a 2.5 with no problem as long as i have the parts. Any thing in my range of mechanical experience i can do would be great. i need 4mph and a little less fuel/oil consumption at 3/4 throttle. The best prop i can run is on it now. and i have gone to extent of moving weight of tackle thru out the boat by 30 pound increments. I get 69.6 mph gps with 2 people and loaded boxes and livewells and 71 empty on a 94 skeeter 200sx. the efi was 7mph faster. OH and 19 gallons of fuel will use 1 gallon of oil.
    anything like plug or reeds or cheap injectors i can swap?

  2. #2
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    Mar 2008
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    Tourist Trap, Florida
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    Oil is controlled by computer, as is everything else related to performance. I would have a merc tech run a scan of it, and check the part #'s on the computer. Less than 100 hrs on an old motor seems suspicious also. Maybe check for an oil leak from hoses/pump. Could be a diff computer than orig that came on motor.....

    83 V-King, 96 Mariner, 200 hp ff block 2.5 w/a 28p choppa
    We gotta clean this liberal mess up, VOTE TRUMP TO MAGA!
    Rebuild thread:
    http://www.screamandfly.com/showthre...-it&highlight=
    http://www.screamandfly.com/showthre...cs.&highlight=
    Videos

  3. #3
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    I will get it checked asap but the hours are real. The motor sat in storage on a insurance/fraud case for 13 years. I was just trying to check on oil and see what simple mods can be done. Not looking for a screamer out of this one but maybe just a little more pep will do

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