Go Back  The Hull Truth - Boating and Fishing Forum > BOATING FORUMS > The Boating Forum
Reload this Page >

What Finally Killed Your Yamaha OX66?

Notices
Like Tree10Likes

What Finally Killed Your Yamaha OX66?

Old 05-21-2019, 10:20 AM
  #1  
Senior Member
Thread Starter
 
Join Date: Oct 2017
Location: Newburyport, MA
Posts: 610
Default What Finally Killed Your Yamaha OX66?

For those who have owned these outboards, I'm curious to know what was the item that finally broke, that made you decide to move on to another motor? Or was it just the fuel and oil cost or the smoke and noise. I have a 2001, 250 HP with under 500 hours. I figure that age will kill it before the hours. Something will dry-out or corrode. I would like to keep it a few more years before making the investment into re-powering.

Are there any preventative measures that can be taken to extend the life of this motor?
Toothpick 10 is offline  
Old 05-21-2019, 10:26 AM
  #2  
Senior Member
 
Join Date: Mar 2010
Location: GTC, Abaco Bahamas/western NC
Posts: 1,309
Default

Use it!
Tingum is offline  
Old 05-21-2019, 10:34 AM
  #3  
Senior MemberCaptains Club Member
 
Join Date: Mar 2003
Location: United States
Posts: 9,206
Default

Lots of oil, stay on top of the cooling system, lube the grease points and keep water out of the fuel.

Rarely do rotating assemblies wear out. It is the trim system, lower unit or constant small issues that make the owners give up.

Having said that, fuel/oil economy plus noise and smoke are a strike against them for many.
captbone is offline  
Old 05-21-2019, 10:42 AM
  #4  
Senior MemberCaptains Club Member
 
Join Date: Nov 2004
Location: Media, PA and Brigantine, NJ
Posts: 1,055
Default

For me it was the power head gasket was leaking cooling water (guess) as the power head needed to be removed to diagnose. Was told by numerous techs removing a 20yr old power head used in saltwater since new could lead to numerous sheared bolts. I may have just continued running it but the trim/tilt was nickle and diming me to death. 20 years, 1,200+- hours owned since new. I miss that old girl, never left me stranded, clean oil and fuel, cooling system flush with vinegar every few years and it still ran like a dream when I traded it in. 1999 225 OX66 Simple to put a wrench on it too.
TimC2520 is offline  
Old 05-21-2019, 10:47 AM
  #5  
Senior Member
THT sponsor
 
Parker Yacht's Avatar
 
Join Date: Jan 2009
Location: Ft Lauderdale
Posts: 7,459
Default

Originally Posted by captbone View Post
Lots of oil, stay on top of the cooling system, lube the grease points and keep water out of the fuel.

Rarely do rotating assemblies wear out. It is the trim system, lower unit or constant small issues that make the owners give up.

Having said that, fuel/oil economy plus noise and smoke are a strike against them for many.
Pretty well states it.
Kinda like having a LED TV.
Does your tube TV work fine? Yup. But watching something on an HD LED opens you up to a whole new slew of sights.
Does your OX work? Yup. But, not having that noise and smoke constantly is sure nice. (Every once in awhile it's nice, to take you back to "that day").
Parker Yacht is offline  
Old 05-21-2019, 05:39 PM
  #6  
Senior Member
Thread Starter
 
Join Date: Oct 2017
Location: Newburyport, MA
Posts: 610
Default

Originally Posted by TimC2520 View Post
I may have just continued running it but the trim/tilt was nickle and diming me to death.
I have heard several people say that as these motors age, the tilt/trim can be the most problematic and expensive to repair.
Toothpick 10 is offline  
Old 05-21-2019, 05:44 PM
  #7  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2008
Location: S. Florida
Posts: 5,296
Default

Mine died when a bad ground killed the oiling system. Apparently the float and the alarm depend on the same ground wire.
Texas 17 is online now  
Old 05-21-2019, 06:04 PM
  #8  
Senior MemberCaptains Club MemberPLEDGER
 
Join Date: Jan 2002
Location: Goldsboro, NC, USA
Posts: 2,311
Default

225 hp, Inside rusted from I guess not being flushed after every use. Think if it had been maintained properly it would have lasted many more years.
silverg is offline  
Old 05-21-2019, 06:05 PM
  #9  
Junior Member
 
Join Date: Apr 2019
Posts: 21
Default

Op, amazing that you write this post today as I was on the phone this afternoon getting a quote on a repower. I also have a 2001 ox66 250hp..... an absolute tank and incredibly reliable but as mentioned above the oil consumption, smoke, lack of fuel efficiency and the pure uglyness of the engine added to the fact that I hit something last weekend and bent the prop shaft has me seriously considering a repower before I even spend one dollar just to see what doing the repair work on the shaft will end up costing me.
Peerless1616 is offline  
Old 05-21-2019, 06:11 PM
  #10  
Senior Member
 
Join Date: Jul 2005
Location: Marlton NJ
Posts: 303
Default

On one of mine the trim motor went last year. I have bad corrosion around the thermostats in the block. Its almost threw the block now. I have owned them since 5 years old and I flush after every use. They still are bad. I am cleaning the area every spring and filling the corrosion with marine-tex then grinding it all smooth with a dremal tool. So far its not getting much worse and the epoxy is holding it back. When it does eat all the way ill drill it out and sleeve it.
flukin nuts is offline  
Old 05-21-2019, 06:15 PM
  #11  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2010
Posts: 139
Default

Had a 2001 150, was perfectly maintained and I did flush regularly but head corroded through. I traded for a rebuilt 200 but had an alarm the other day and wishing I just had upgraded to new.
MSchwartz is offline  
Old 05-21-2019, 06:56 PM
  #12  
Senior Member
Thread Starter
 
Join Date: Oct 2017
Location: Newburyport, MA
Posts: 610
Default

Originally Posted by Peerless1616 View Post
Op, amazing that you write this post today as I was on the phone this afternoon getting a quote on a repower. I also have a 2001 ox66 250hp..... an absolute tank and incredibly reliable but as mentioned above the oil consumption, smoke, lack of fuel efficiency and the pure uglyness of the engine added to the fact that I hit something last weekend and bent the prop shaft has me seriously considering a repower before I even spend one dollar just to see what doing the repair work on the shaft will end up costing me.
That sucks, but you should be able to just pick up a replacement lower unit, correct?
Toothpick 10 is offline  
Old 05-21-2019, 06:56 PM
  #13  
Senior MemberCaptains Club Member
 
Join Date: Mar 2003
Location: United States
Posts: 9,206
Default

One thing that I have used to ease the pain of still running two stroke engines is using the cheapest TCW3 oil possible. I have used Supertech from Walmart at $12.88 a gallon for years in all my two strokes with lot of success. I even put some in the tank in addition to the oil injection system for added lube. I keep that fat pig nice and wet.

I have yet to read of a failure directly linked to the oil.
captbone is offline  
Old 05-21-2019, 07:54 PM
  #14  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2008
Location: Annapolis, MD
Posts: 559
Default

I think most folks who say they repowered from a 2-stroke to a new 4-stroke (or DFI 2-stroke) because of fuel consumption, smoke or noise are just repeating the sales pitch they gave their wives. If you do the math, most will never realize a real money savings when comparing the cost of a new engine vs the cost of more fuel. I burn between 400-500 gallons a year with my twin 250 OX66’s. These engines probably burn 40-50% more fuel than a comparable modern 4-stroke. So my 400-500 gallons would be more like 275-340 gallons with a modern engine, or an average savings of about 150 gallons. At $3.50/ gallon, that’s about $525/year savings. Sounds like real money. New 250 HP 4-strokes are going to run me about $45k rigged. I better figure out a way to live a lot longer...

As far as smoke, switching to Penzoil has greatly reduced to smoke I would get using Yamalube. And my O2 sensors no longer foul after 50 hours or so. Noise...really?...Sure, 4-strokes are quieter. But does the noise of a 2-stroke really over-ride the noise of a 35 MPH wind in your face while on plane with the engines 10 feet behind you? Even at idle, I have no problem with conversation at normal talk volume.

Most folks buy buy new cars because they get bored, or want the latest and greatest, not because a new car gets better fuel economy. I think it’s the same with outboard engines...
jfbetz is offline  
Old 05-21-2019, 10:07 PM
  #15  
Senior Member
 
Join Date: Feb 2002
Location: richmond va usa
Posts: 768
Default

Bad injector no oil to cylinder
donald/tri-again is offline  
Old 05-21-2019, 10:41 PM
  #16  
Admirals Club Admiral's Club Member
 
Join Date: Dec 2016
Location: Apollo Beach, FL
Posts: 822
Default

Originally Posted by jfbetz View Post
I think most folks who say they repowered from a 2-stroke to a new 4-stroke (or DFI 2-stroke) because of fuel consumption, smoke or noise are just repeating the sales pitch they gave their wives. If you do the math, most will never realize a real money savings when comparing the cost of a new engine vs the cost of more fuel. I burn between 400-500 gallons a year with my twin 250 OX66’s. These engines probably burn 40-50% more fuel than a comparable modern 4-stroke. So my 400-500 gallons would be more like 275-340 gallons with a modern engine, or an average savings of about 150 gallons. At $3.50/ gallon, that’s about $525/year savings. Sounds like real money. New 250 HP 4-strokes are going to run me about $45k rigged. I better figure out a way to live a lot longer...

As far as smoke, switching to Penzoil has greatly reduced to smoke I would get using Yamalube. And my O2 sensors no longer foul after 50 hours or so. Noise...really?...Sure, 4-strokes are quieter. But does the noise of a 2-stroke really over-ride the noise of a 35 MPH wind in your face while on plane with the engines 10 feet behind you? Even at idle, I have no problem with conversation at normal talk volume.

Most folks buy buy new cars because they get bored, or want the latest and greatest, not because a new car gets better fuel economy. I think it’s the same with outboard engines...
All valid points and I’m not being argumentative or disagreeing here, but The noise difference really is substantial. Of course conversation is possible at idle with most “modern” 2 smokers but the difference with 4 strokes is significant. Long runs offshore/etc you can actually hold convo with passengers on plane with 4 strokes, which to me makes a big difference if running 2+ hours.

is it worth 20 or 40 grand? All in the eye of the beholder I guess.
Burgmane is offline  
Old 05-21-2019, 11:27 PM
  #17  
Member
 
Join Date: Sep 2018
Location: NE Florida
Posts: 43
Default

I have twin 2013 200HO Etecs and came from a single 150 ox66...at 40mph those 200's are quiteter than than the one 150hp ox 66 at the same speed in a 19ft center console. . The wind is indeed louder than the motors. When I crank the motors I have to look at the tac to know it started as they make less noise at idle than the tell tail stream hitting the water.
DaveinJax is offline  
Old 05-22-2019, 05:16 AM
  #18  
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tampa Florida
Posts: 4,943
Default

Originally Posted by Burgmane View Post


All valid points and I’m not being argumentative or disagreeing here, but The noise difference really is substantial. Of course conversation is possible at idle with most “modern” 2 smokers but the difference with 4 strokes is significant. Long runs offshore/etc you can actually hold convo with passengers on plane with 4 strokes, which to me makes a big difference if running 2+ hours.

is it worth 20 or 40 grand? All in the eye of the beholder I guess.
when i had my 250 ox66 after a day off shore (1-1.5 hour run one way) by the end of the day my throat was so sore from trying to hold a conversation during the ride out and back in!
Rolandt03 is offline  
Old 05-22-2019, 05:17 AM
  #19  
Senior MemberCaptains Club Member
 
Join Date: Jan 2007
Location: Tampa Florida
Posts: 4,943
Default

the OX 66 line usually does not die, they get retired!
Rolandt03 is offline  
Old 05-22-2019, 05:19 AM
  #20  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2013
Posts: 4,591
Default

Originally Posted by Rolandt03 View Post
when i had my 250 ox66 after a day off shore (1-1.5 hour run one way) by the end of the day my throat was so sore from trying to hold a conversation during the ride out and back in!
They are NOISEY.........
avalonandl is online now  

Thread Tools
Search this Thread