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I'm interested in feedback from owners of this motor regarding it's fuel efficiency.
I'm looking to upgrade from my 1986 200HP Yamaha and my 9.9HP Johnson Kicker.The boat is completely restored/updated with the exception of the power.
I plan to either go with twin 115-150s and remove the kicker or go with a single and a new 15HP kicker.
If I find the right deal I'll jump to either Yamaha or Suzuki 4-stroke twins or a single. I'm just having a hard time with spending 15-20k right now. In other words if $$$s were no object I'd put 4-stroke twins on her and be done with it.
Let me know what you know about the 1999 Yamaha 225 SWSII EFI as a single.
Please email me if you know of any good motors for sale that may fit my need.
I had a 97 225 EFI yami on an old 21ft mako. Real numbers with three guys and full load of tackle/ice were 2.3mpg-2.6mpg, depending on seas. Very smooth, powerful engine.
I've got a 1999 225 OX66 with 960 hours. I've only had to replace the spark plug boots. As far as economy, mine is mounted on a 1999 23' Contender and average 2 MPG on any given trip. On any offshore trolling day, I may log 160 miles for the day. That include 50-60 miles out and back and trolling. I normally cruise around 32 MPH. If you get the oiler adjusted right, you'll be close to 50:1 not quite, but close. The HPDI and Four stroke are the way to go for efficiency. I've been pleased with mine.
They were called EFI in 1997, then yami called them OX-66. Same engine. Make sure you're looking at a '99 model year engine and not a '97 that was put in service in '99. Are you sure it's an EFI?
The 225 SWS2 225 was introduced in EFI version in 1997. The 1997 SWS2 was designated OX66 since it was fuel injected and and had an O2 sensor, along with other sensors. The 225 OX66 not only has ignition control sensors and an oxygen sensor but overtemp sensors, knock sensor, ambient air sensors, and atmospheric pressure sensor. These all allowed for more precise fuel metering. Overall the SWS2 225 OX66 should be about 10% to 15% more effecient than the carb model that was also sold but was not called SWS2 OX66.
I saw a new ox66 225 on closeout for $9995 advertised up here in Delaware (no sales tax). I am sure rigging would be another $1K plus; On the other hand, I have seen some boaters repower 3 year old engines because they have to have the newer technology...now. Heck, you could probably advertise on this board and someone may have the engine you are looking for slightly used.
I went to that guy in Delaware to repower my boat. That deal is on the extra long shaft only.
I have 91 GW Seafearer w/ a 2000 ox66 and get specs similar to dreamweaver. I would stay away from twins if I were you. The extra weight, especially with four strokes is a serious consideration. It also looks like you have a notched transome. That extra weight on a notched transome could be real trouble.
I have a 1998 225HP Yami OX66. I bought it new. It runs well. I get about 2 MPG total at the end of the day fishing on my 22 footer. Good Motor, no problems since new.
Thanks you guys are a ton of help. I'm leaning towards a single and a kicker to keep the cost down.
Yes, I have a 86 Grady 24' Offshore with a notched transom that is rated for 300hp (twin 150s) which weighed 415 lbs each in 1986. Which means I could currently I get the Yamaha Four Stroke F115s (402 lbs) or the Suzuki DF140s (410 lbs) and still be under the spec with twins. The Yamaha F150s are a little heavy at 466 lbs and real heavy on the pocket book.
I had a 98 on a Whaler Outrage 21. My fuel numbers at optimum cruise (3000-4000rpm, 25-35mph) were 3.0-3.3 -- no t-top, two people, 90-120 gallons of fuel. The basic boat weighed about 2500 lbs, prop was Mirage Plus 15.5x17. I loved the thing...gave it up when I went to larger boat.
Don't forget the additional cost for controls, gauges, oil tank and cables if you go with a different brand. Also remember you'll be drilling additional hole in the transom if you go with twins. What happens if you cant use the existing holes with the new twins?
1999 Yamaha 225 SWSII EFI: Feedback???? 
