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Old 03-16-2003, 03:55 PM
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drb
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Default can someone explain Yamaha Saltwater ox66 series

Was the ox66 only applicable to the Saltwater Series 250 engine or all the Saltwater Series engines? I just read a post on another board where a guy had endless problems with powerheads and fuel pumps on his 250 ox66 Saltwater Series Yammy. I recently read a post on this board on the reliability of the Saltwater Series 200 Yamaha and was confused? Bad apple or bad barrell? Thanks
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Old 03-16-2003, 04:05 PM
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AC
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Default can someone explain Yamaha Saltwater ox66 series

The 250 was the first saltwater series to get EFI (ox66)around '97.The 200 got EFI around '99.Neither the EFI motors or the carb models had a history of problems.Both have been very reliable.
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Old 03-16-2003, 05:08 PM
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Default can someone explain Yamaha Saltwater ox66 series

The Yamaha ox66 engines are very reliable.

I love mine, and it's a '97 which was their first year. Runs like a top, fuel effiecient. Yamaha does their homework on new technology.

Too bad the American manufactures don't do the same.

John
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Old 03-16-2003, 05:34 PM
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Default can someone explain Yamaha Saltwater ox66 series

Yamaha started calling several of their engines Salt Water Series (SWS) back in '94. I think the 150hp's & higher got that designation. They were regular 2-stroke outboards with oil injection. The SWS designation was a result of some improvements for operating in a saltwater environment: more stainless steel components, improved paint job, ...

For model year '96 or '97, Yamaha started using electronic fuel injection (EFI) on the SWS engines. They were still conventional 2-stroke engines with oil injection, but now had EFI. These were the OX66 family -- speicial oxygen sensor onboard that helped determine the right fuel/oil mix. I think Yamaha called them "SWS II" and were produced in 150/200/225/250hp. Many people thought EFIs were only a transitional engine technology for Yamaha. They've proven to be reliable engines, though not really more fuel efficient than the pre-EFIs.

The next step was the transition to direct fuel injection around 2000. Yamaha's name was "HPDI", for High Pressure Direct Injection. Those were initially produced in 150 & 200hp; the 225 & 250hp remained EFI until last year. Not sure if they still called them SWS II though.

Yamaha does make a 225hp in HPDI in a series called VMax, but it's short shaft only, and works for flats and bass boats only (low deadrise). Not sure why they never produced it in a 25" shaft?

Hope that helps...


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Old 03-17-2003, 04:44 AM
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Default can someone explain Yamaha Saltwater ox66 series

thx...that does help
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Old 03-17-2003, 05:31 AM
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Default can someone explain Yamaha Saltwater ox66 series

that's what i have.i do not have a clue as to what makes it tick or why it ticks but all i can tell you is after having a inboard for about six seasons and coming back to an outboard,the only other outboard i ever had was an omc brand,the yamaha is very quiet almost smokeless and has been very reliable.i'd do it again
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Old 03-17-2003, 08:36 AM
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Default can someone explain Yamaha Saltwater ox66 series

Keep in mind that power head repairs can range from a factory rebuid to a local guy sorting through used parts to make one work. I have seen where some local guys have pulled parts from other used engines to provide a rebuilt power head to the unsuspecting buyer. This may not be all that bad, provided the parts are miced and within spec. My only point is some of these repeat power heads failures could be related to the fix source.
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Old 03-17-2003, 10:02 AM
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Default can someone explain Yamaha Saltwater ox66 series

...Here's what the guy said about his twin 250 SWS ox66..

"As many of you know it's been over four months that I have been at it with Yamaha over my 2 Strokes that were nothing but a problem for me since day one. Two powerheads replaced and six fuel pumps later Yamaha finally decided that they can't get the engines to run properly. It's been said that the 250's have had there share of problems. Well not for me any longer. They agreed to replace the 2 strokes for four strokes and gave me full retail on the 2 strokes. Installation, freight and trailering will all be on there bill. What a battle but well worth the time and effort. Now I'm just waiting for the engines to arrive at the dealer for them to do the installation, just in time to do some serious fishing."
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Old 03-17-2003, 04:47 PM
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Default can someone explain Yamaha Saltwater ox66 series

When I was shopping last spring, a couple of dealers explained to me that the 225 and 250 operated differently than the 200hp and below. The way I understood it, when at low idle the 225 & 250 drop a couple of cylinders. When I asked if it was like old Cadillac 8/6/4 that dropped cylinders to run more efficiently they said it was the same idea. I got the 200hp and have had no problems. Not sure if its true, just what I was told.
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Old 03-17-2003, 07:44 PM
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Default can someone explain Yamaha Saltwater ox66 series

Thats funny,I havent heard of any problems like that at all.Any motor can fail,but continues problems is not something you here about with Yamaha.I have T/225's and before that a 200.All 0x66 models.100% flawless operation.
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Old 03-18-2003, 07:05 AM
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Default can someone explain Yamaha Saltwater ox66 series

HIS PROBLEM WAS PROBOBLY BAD FUEL. THERE IS A VERY FINE MESH F. FILTER IN THE PRESSURE PUMP LOCATED IN THE VAPOR SEPORATOR. IF THAT GETS CLOGGED THE PUMP BURNS UP, REDUCING FUEL PRESSURE. IF IT IS RAN WHILE THIS IS HAPPENING IT COULD GO LEAN AND POP.
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