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What Finally Killed Your Yamaha OX66?

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What Finally Killed Your Yamaha OX66?

Old 05-22-2019, 05:21 AM
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Originally Posted by captbone View Post
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.
are we talking women or motors?

after reading alot here on THT about various oils, there really is not enough difference in a weekend warrior application to justify the crazy oil prices that some of these folks pay! i am with you, used nothing but Supertech from walmart and let her eat! never had an oil related issued! the one thing i love about the 4 stroke is not having to always dump a gallon of oil in it! get to the boat, realize you forgot oil, have to find a store that is open, back to the boat, headache!
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Old 05-22-2019, 05:23 AM
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Originally Posted by avalonandl View Post
They are NOISEY.........
they are noisy, a pair of 2 smokes screaming has a sexy sound to them, cant say a pair of 4 strokes have that same sexy sound! i will take quiet over sexy sound any day of the week!
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Old 05-22-2019, 05:25 AM
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My bayboat has an '03 150hp OX66... All my buddies have 4 strokes...I miss the smell and noise...I love hearing that ol girl sing..My biggest issue is she's a gas hog when hailing tail.. I just don't have the range with a 52 gallon tank to hit some of the areas I'd like to on the right days..So I end up having to hitch rides offshore when I'd rather be on my boat..
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Old 05-22-2019, 05:25 AM
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Originally Posted by Toothpick 10 View Post
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?
i could be wrong, but i think yamaha had the first VRO system that actually worked and has proven very reliable! in the begining of VRO systems, it was usually in the best interest of the motor to bypass it and pre-mix
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Old 05-22-2019, 05:32 AM
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“What Finally Killed Your Yamaha OX66?”

Fuel prices! When gas hit $5/gallon back in 2006/2007, a repower saved me almost $5000/yr (30% improvement in fuel economy)


I kept those new motors for 10 years before selling the boat. Besides the benefit of quietness, no smoke, and no oil, buying them was actually a positive return on investment

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Old 05-22-2019, 05:38 AM
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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 great points and in my case Im also dying to add the extra 100hp that i would gain with a repower, but agree the numbers dont really add up..... I really do want that shiny new sparkly thing hanging from the transom and at 48yrs old I've NEVER had a new anything in my life always bought used and bought cash.... its my time now...
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Old 05-22-2019, 05:41 AM
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1 of my 200's overheated and blew up . The heat alarm went off at the same time the engine fried . Giant black garbage bag wrapped around the lower unit at 4700 rpms coming in the inlet for weigh in at a tournament . The other had a groove dug into a cylinder wall when a screw head sheared off from the carbs and ended riding up and down with a piston eventually being imbedded into the piston
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Old 05-22-2019, 06:02 AM
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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.
I burn that much fuel in 1 1/2- to 2 months, boating in Florida 12 months of the year.

Rework your numbers using those parameters (with E90 non-ethanol fuel currently at $4/gallon...or $5/gallon when I repowered in 2006), and see if it makes financial sense

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Old 05-22-2019, 06:51 AM
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Originally Posted by bw17 View Post
Quote:
Originally Posted by jfbetz
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.

I burn that much fuel in 1 1/2- to 2 months, boating in Florida 12 months of the year.

Rework your numbers using those parameters (with E90 non-ethanol fuel currently at $4/gallon...or $5/gallon when I repowered in 2006), and see if it makes financial sense
Burning 500 gallons every 2 months is a lot; much more than your average boater. But let's do the math. 500 gallons every 2 months = 3,000 gallons/year. Using your 30% fuel economy savings equates to burning 2,300 gallons with new engines. That's a savings of 700 gallons a year. At $4.00/gallon, that's $2,800/year savings. For me, to replace twins, it's going to be $45K. That's a 16 year repayment if I burned 3,000 gallons/year, not factoring in the time value of money. That might get my attention enough to consider re-powering. However, most people don't keep their boats 16 years. You indicated you sold the boat after 10 years. And again, your fuel consumption is abnormally high. For me (and the average boater), at 500 gallons/year, the repayment would be 80+ years. Never gonna be close to making financial sense...but it sure would be nice to have a set of shiny new 4.2L 250's or 4.6L V-8's back there...no doubt about that.
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Old 05-22-2019, 07:08 AM
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Originally Posted by jfbetz View Post
Burning 500 gallons every 2 months is a lot; much more than your average boater. But let's do the math. 500 gallons every 2 months = 3,000 gallons/year. Using your 30% fuel economy savings equates to burning 2,300 gallons with new engines. That's a savings of 700 gallons a year. At $4.00/gallon, that's $2,800/year savings. For me, to replace twins, it's going to be $45K. That's a 16 year repayment if I burned 3,000 gallons/year, not factoring in the time value of money. That might get my attention enough to consider re-powering. However, most people don't keep their boats 16 years. You indicated you sold the boat after 10 years. And again, your fuel consumption is abnormally high. For me (and the average boater), at 500 gallons/year, the repayment would be 80+ years. Never gonna be close to making financial sense...but it sure would be nice to have a set of shiny new 4.2L 250's or 4.6L V-8's back there...no doubt about that.
owning your own boat doesnt make financial sense either! either you want it and get it or you keep trying to find a way to justify it!
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Old 05-22-2019, 07:54 AM
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Sold my boat with twin 2002 150s with just shy of 1,600 hours. They were rock solid. Never thought they would leave me stranded. But now that I have 4 stroke verados - I don't think I'd go back to the 2 stroke game!
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Old 05-22-2019, 08:01 AM
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I have a 2000 250hp OX66 that is still very reliable, even after sitting for 2-3 weeks. Cranks right up. Only issue I've had is with the trim/tilt assembly. My progression has been in reverse. 4 stroke - HPDI - carbureted 2 stroke - OX66. as long as I'm not idling downwind the smell, smoke and noise don't bother me. It's the perfect power for my boat.
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Old 05-22-2019, 08:05 AM
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I have owned a bunch of 2-stokes- including 6 OX66's
have 2 '99 200-ox's now with around 850 hours.

I would love the quiet-ness and efficiency of a 4-stroke. I am a cheapy, can't justify spending 30-40k repowering the old girl.

To answer OP I have only lost 1 OX in an estimated 15 years (with ox's) 200 hours per year usage. A 250 blew up on my Contender- ultimately my fault because i lost track and did not fill oil tank. BUT the alarm failed and never told me.
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Old 05-22-2019, 08:09 AM
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2 motors oil pump add oil to gas
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Old 05-22-2019, 08:41 AM
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a little extra fuel
a little extra noise
a little extra oil

a lot of extra $$$$$ in the bank

when my powerhead blows up, i'll buy a whole nother motor for less than the cost of a rebuilt powerhead and let that ride another million hours lol
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Old 05-22-2019, 10:58 AM
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My 1998 OX66 150s are running great (knocking on my wooden desk). I do have them maintained every year. Like mentioned above the switch to Penzoil really has decreased the smoke and odor especially after initial startup, My plans for when the old girls die, get rid of the boat. I am not going to dump 25-30k into a 1998 hull. I will be surf fishing again. . BTW these are the 1st 2-strokes I have ever owned had Yamaha and Suzuki 4s prior, I love the sound of these at hard throttle, its like an old muscle car vs imports.
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Old 05-22-2019, 01:29 PM
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I was in the OX camp for many years. Could never justify repowering costs until.......

Yamaha Saltwater Series ''Hole in the Head''

I loved my OX's, they were very reliable, easy to work on, and started everytime.

My new to me 4 strokes don't get much better mpg, maybe .3-.4 but I can cruise at 40 miles burning what I used to burn at 32. Plus no more buying 2 stroke oil.

After purchasing my pair of 05' Yamaha 250's I couldn't believe I waited so long. Love them even more!~

Corrosion will kill your old OX 66's. Pull the heads and check for the pin holes.
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Old 05-22-2019, 01:39 PM
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Originally Posted by jfbetz View Post
Burning 500 gallons every 2 months is a lot; much more than your average boater. But let's do the math. 500 gallons every 2 months = 3,000 gallons/year. Using your 30% fuel economy savings equates to burning 2,300 gallons with new engines. That's a savings of 700 gallons a year. At $4.00/gallon, that's $2,800/year savings. For me, to replace twins, it's going to be $45K. That's a 16 year repayment if I burned 3,000 gallons/year, not factoring in the time value of money. That might get my attention enough to consider re-powering. However, most people don't keep their boats 16 years. You indicated you sold the boat after 10 years. And again, your fuel consumption is abnormally high. For me (and the average boater), at 500 gallons/year, the repayment would be 80+ years. Never gonna be close to making financial sense...but it sure would be nice to have a set of shiny new 4.2L 250's or 4.6L V-8's back there...no doubt about that.
... only if gas stays at $4.00/gallon for those 16 years. Plus older motors are going to require more maintenance, repairs, annoyance, and downtime. There is more to it than simple math. I say this as someone who is running 2001 HPDIs, lol.
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Old 05-22-2019, 02:02 PM
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I see older f250s going for 7500 all day long. Can someone redo the math without the idea of buying brand new off the lot engines?

I can sell my ox66 for $3k and buy a newer f250 for 7500$

Total investment is 4500. That's chump change to have twice the fuel economy and the thing starts like a car everytime
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Old 05-22-2019, 02:22 PM
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Originally Posted by Fordy View Post
I see older f250s going for 7500 all day long. Can someone redo the math without the idea of buying brand new off the lot engines?

I can sell my ox66 for $3k and buy a newer f250 for 7500$

Total investment is 4500. That's chump change to have twice the fuel economy and the thing starts like a car every time
I was able to get a pair of 05 F250's with 1400hrs on them for $13,500.
I sold my pair of running OX's for $3500. Sold the rigging and gauges I did not need along with the oil tanks and props for another $1000.
I am into my motors for under $10k rigged and loving them.

That's where the repower made sense in my case.
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