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Author Topic:   225 OX66 Yamaha Saltwater Series II
rapidrobert posted 10-09-2002 01:43 PM ET (US)   Profile for rapidrobert   Send Email to rapidrobert  
I noticed that subject motor is not shown on the Yamaha web-site. Any explanation for this?
Bigshot posted 10-09-2002 01:57 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
2002 was last year I believe.
rapidrobert posted 10-09-2002 04:17 PM ET (US)     Profile for rapidrobert  Send Email to rapidrobert     
Thanks bigshot. I wonder if the motor had problems?
lhg posted 10-09-2002 04:33 PM ET (US)     Profile for lhg    
According to the 2003 catalog, Yamaha has no 225 or 250HP engine in the conventional 2-stroke category in 25" or 30" shaft length. Since J/E doesn't either, Mercury's 225 & 250 EFIs have the conventional 2-stroke field to themselves in this HP range.

With Yamaha your choices for an offshore Whaler type of boat are either the 225 4-stroke or the 250HP HPDI. They have invested the design funds here, and evidently want to make sure of their return.

Peter posted 10-09-2002 06:35 PM ET (US)     Profile for Peter  Send Email to Peter     
There is nothing wrong with the 225 OX66. I have had one for over two years and it has been absolutely flawless. Several friends also have had them for even longer with the same good experience I've had.

I believe that the discontinuation of the 225 OX66 is purely an economic one. The OX66 is not "clean" burning so it would have to be phased out before 2006.

Regarding the timing, one thought is that perhaps they would have had to substantially refresh the tooling to make it through year 2005 so now was a logical time to discontinue, particularly in market conditions where the industry is making a transition over to "clean" technology.

Another thought regarding timing is that Yamaha's success with the OX66s could have been perceived as a problem for them if they are trying to recoup the new investment in "clean" technology. For example, the presence of the significantly cheaper 225 OX66 in the lineup may have made it more difficult to sell the more expensive 4-stroke 225, particularly when the 225 OX66 seems to be almost as fuel efficient as its 4-stroke cousin, just not as "clean" or quiet (some care about these virtues enough to pay the significant premium, some don't). Likewise the presence of the 250 OX66 in the lineup could have made it more difficult to sell the more expensive 250 HPDI.

I wonder if the timing doesn't have something to do with the fact that Yamaha is now selling its 4-stroke to Mercury and has come out with the 250 HPDI.

If I were given a choice between the 225 OX66 versus the 225 4-stroke or the 250 OX66 versus the 250 HPDI, I'd choose the proven OX66 models and keep the extra money.

rapidrobert posted 10-09-2002 06:43 PM ET (US)     Profile for rapidrobert  Send Email to rapidrobert     
All good points lhg and Peter. Thanks for your input.
jimh posted 10-09-2002 07:54 PM ET (US)     Profile for jimh  Send Email to jimh     
I think that OX66 engine had some type of exhaust gas sensor which returned electronic feedback to the fuel system. This is a proven technology used on many automobile engines at present. Thus the OX66 engine was a bit more sophisticated than a simple carburetor engine.
lhg posted 10-09-2002 08:37 PM ET (US)     Profile for lhg    
I think Peter has it right. The 2-stroke EFI is still highly popular, highly reliable, and cost effective, and they didn't need competition from it with the high cost and heavier clean engines.

Mercury has indicated they don't feel this way, and will make the carbed and EFI 2-strokes as long as people want them. They are still 60% of their business. So they now have the 225, 250 & 300 markets all to themselves here.

John from Madison CT posted 10-10-2002 07:26 AM ET (US)     Profile for John from Madison CT  Send Email to John from Madison CT     
I was somewhat dissapointed to learn that Yamaha was discontinuing the 225 and 250hp OX66 EFI's.

You will hear many Outboard experts call these motors one of the most reliable ever made.

While I am confident Yamaha's new big block 250HPDI will be great, I am a traditionalist.
I stick with what works and rarely venture out to try or experiment with new technology.

Hopefully, by the time I need a new engine, the 250HPDI will be old hat, tried and tested.

FWIW, I read Yamaha's Performance Bulletin with the new 250HPDI vs. the 250 OX66 EFI. I believe it was on a Cobia boat.
IMHO, the slight, very slight advantages in Fuel Economy and Acceleration were by no means worth the extra money nor risk of new technology.

John from Madison

Bigshot posted 10-10-2002 09:31 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
10 years ago people were saying the same thing about EFI outboards. They considered it "new" technology and that electronics and outboards do not mix, etc. Now that is old hat....funny, seems like yesterday.
VMG posted 10-10-2002 09:35 AM ET (US)     Profile for VMG  Send Email to VMG     
I had a new 98 OX66 225 on a OR 21. Kept it for two years and then got something a little bit bigger. However...that motor was quiet, fuel efficient (3.3 mpg at cruise) and reliable in many 8-10 hour offshore trips over two years. Drank oil like it was beer on spring break but I'd buy another one in a heartbeat.
Peter posted 10-10-2002 01:37 PM ET (US)     Profile for Peter  Send Email to Peter     
I think that part of the decision has to be related to tooling for the 3.1 liter block that has been around for about 10 years or so. Otherwise, I think that Yamaha is taking a bit of a gamble here by discontinuing the 225 and 250 EFIs, particularly in view of Merc's offering consumers the fullest range of choices. The discontinuation also appears somewhat inconsistent with their continuing to offer the 2.6 liter 150 and 200 EFIs.

Jim, the OX66 has an oxygen sensor used in a feed back loop to control the fuel/air mixture. If there is any weak point about the OX66 motor it is that the sensor requires periodic cleaning. It's not a big deal but performance suffers a little at WOT if the sensor isn't clean.

lhg posted 10-10-2002 02:59 PM ET (US)     Profile for lhg    
So Nick are you now saying that the new technology DFI outboards, Ficht, Optimax and HPDI, can now be considered highly reliable? I'm still a little gun shy about them all, and would only buy one with reluctance. Maybe this will change as time goes by, but not yet.

Neither the Mercury, and then later Yamaha, EFI's ever had the initial problems of the DFI's. They were bulletproof from day one.
The DFI's have already been around for 5 years, and still do not have a great following, so I'm questioning your analogy.

Every time I'm out running my EFI 2-strokes along at 30 mph, I look back and wonder why the marketing hype is giving these conventional 2-stroke engines such a bad name. There is nothing at all wrong with them, except for idle exhaust smoke. They're quiet (quieter than the Opti's and 4-strokes) and smooth, with great power. I can hear the water splashing under my hull. I just don't get it. Then I see the 1000's of diesel trucks on the highway, spewing all that garbage, now a proven carcinogen, in huge amounts, on a daily basis, 24/7. It seems the outboard industry, and the boat buyer, has really been "had". OMC certainly paid this price.

I think Yamaha made a mistake on these 225's.
With the stock market and economy in the tank, it seems like the wrong time to artificially jack up the price of engines. It's going to be a tough year for the industry, again. The pricing on the old carburated 2-strokes is still looking good.

Bigshot posted 10-10-2002 03:30 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Did not realize I said all that. I just said in a long winded version that people are apprehensive to grasp new technology.

I wonder why my neighbor who has a 225 EFI Merc is so amazed at the silence of my 4 stroke? Maybe his is broken:)

larimore posted 10-14-2002 05:10 AM ET (US)     Profile for larimore  Send Email to larimore     
I have a 1999 225 ox66. I am pretty sure that is the last year they made them. In 2000 Yamaha went to Direct fuel injection. I bought the motor because it was the last chance at "proven" technology. The motor has been very good, except for warranty replacement of the $300 oxygen sensor. At the time they indicated that the sensor had been "re-designed". Its a great motor.
kingfish posted 10-14-2002 09:23 AM ET (US)     Profile for kingfish  Send Email to kingfish     
I have a 2001 OX66 225 so I know they were produced at least that long and as was said earlier in this thread, they may have gone into 2002. Yamaha apparently was producing both the HPDI 225 and the OX66 225 from whenever the HPDI version came out through the 2002 production year.
k joseph posted 10-14-2002 06:59 PM ET (US)     Profile for k joseph  Send Email to k joseph     
just had a 2000 0x66 225 put on my revenge and love it so far .. what a difference over those dirty rotten johnsons
jamesandyman posted 08-26-2010 02:01 PM ET (US)     Profile for jamesandyman  Send Email to jamesandyman     
[The first post from this author revived this discussion which has been dormant for ten years. After reviving the discussion the author then impugned the outboard engine under discussion as well as participants in the the discussion. I have deleted this article. Please start a new thread instead of reviving ones that have been dormant for ten years. First posts with too much vitriol tend to be ignored.--jimh]
larimore posted 07-02-2012 08:21 PM ET (US)     Profile for larimore  Send Email to larimore     
I've had my 1999 OX66 225sx now for 13years with minimal problems- O2 Sensor replaced way back with a redesigned model; all six fuel pump diaphragms after running out of fuel recently; clean the O2 sensor - A jewel compared to my 1989 Johnson that barely made 10 years.
jimh posted 07-02-2012 10:38 PM ET (US)     Profile for jimh  Send Email to jimh     
Let's put this thread back to sleep. It looks to me like someone with an axe to grind found this thread on a search engine and decided to grind his axe.
seahorse posted 07-03-2012 08:41 AM ET (US)     Profile for seahorse  Send Email to seahorse     

Is that a record that someone revived a decade old thread?

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