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Yamaha OX 66

Old 05-13-2019, 07:33 AM
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Default Yamaha OX 66

I have a Yamaha 250 OX 66 Saltwater II fuel injected motor given to me by the widow of an old friend that passed away. Came off his Grady White he re powered. The motor has sit on a stand in his garage for at least 5 years. The problem is, he painted the motor white. Painted over the information/ ID sticker. I've tried to clean it but it obvious I'm not going to be able to read it. Any other way to ID the model and year of this motor. I know his Grady was a 1999, I recall him talking about the motor being a year or two newer few times.
Thanks

Last edited by trollme; 05-13-2019 at 07:43 AM.
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Old 05-13-2019, 08:56 AM
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In the 7 or so years they were made if I'm not mistaken they were all the same, as long as it's a sx/lx
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Old 05-13-2019, 09:57 AM
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Inspect the block in the vicinity of the starter motor. Try and find a round decal with some numbers on it. What are they.

Now inspect the CDI. What are the numbers on it?
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Old 05-13-2019, 10:00 AM
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Originally Posted by wetneck View Post
In the 7 or so years they were made if I'm not mistaken they were all the same, as long as it's a sx/lx
You are mistaken.
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Old 05-13-2019, 11:01 AM
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Originally Posted by alloyboy View Post
Inspect the block in the vicinity of the starter motor. Try and find a round decal with some numbers on it. What are they.

Now inspect the CDI. What are the numbers on it?
I will do this and report back.
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Old 05-13-2019, 11:07 AM
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They are popular and hardy motors. I bet you can get 2k for one that runs. You will need to clean the fuel system and change water pump.

We have 2 on our Intrepid and push it along at 40+ when we want to. mostly cruise at 30 1 mpg.
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Old 05-14-2019, 06:32 AM
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Originally Posted by alloyboy View Post
Inspect the block in the vicinity of the starter motor. Try and find a round decal with some numbers on it. What are they.

Now inspect the CDI. What are the numbers on it?
No sticker by starter. This sticker on the rear of block. Didn't find any numbers on CDI. Compression 110 to 112 cold with quality gauge. Old numbers marked on block show 110 to 115 psi. Pushed clean gas through system. Hit the starter and she fire right up. Thermostats and popit value removed show some build up. Control looks new. But looks good. Have it mounted on my Aquasport. I might be good.



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Old 05-14-2019, 07:36 AM
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No numbers you can find on transom mounting bracket? There should be a plate there.
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Old 05-14-2019, 07:41 AM
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Originally Posted by avalonandl View Post
No numbers you can find on transom mounting bracket? There should be a plate there.
i think they were painted over when the motor turned white!
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Old 05-14-2019, 07:42 AM
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OP- those motors are damn near bullet proof! you have good compression, make sure your oiling system is working properly, service the lower unit and let her rip!
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Old 05-14-2019, 07:58 AM
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We had a pair on a regulator 26. We bought it where the previous owner was pre mixing the oil in the fuel tank as the oil system was disconnected. My understanding a lot of old time guys did this. Engines ran mint. 1998s
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Old 05-14-2019, 08:05 AM
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Originally Posted by trollme View Post
No sticker by starter. This sticker on the rear of block. Didn't find any numbers on CDI. Compression 110 to 112 cold with quality gauge. Old numbers marked on block show 110 to 115 psi. Pushed clean gas through system. Hit the starter and she fire right up. Thermostats and popit value removed show some build up. Control looks new. But looks good. Have it mounted on my Aquasport. I might be good.
1998 S250TXRW. Complete engine ID is 61AX 101471.

Perhaps the markings on the CDI are on the other side of the device.

Here is the parts catalog for your motor but buy parts from Andy at www.simyamaha.com or Ole at https://www.parkeryacht.com/

https://www.boats.net/catalog/yamaha.../1998/s250txrw

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Old 05-14-2019, 08:10 AM
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Do a full service and go boating. She'll treat you well.
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Old 05-14-2019, 08:15 AM
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Originally Posted by Rolandt03 View Post
OP- those motors are damn near bullet proof! you have good compression, make sure your oiling system is working properly, service the lower unit and let her rip!
unfortunately the oiling system has been removed. If all checks out. I will invest in a new oiling system. No I'm not afraid of oil injection. When property maintained your good. For now it will be the basics. Just like to know the exact year and model for ordering replacemt parts. I will figure it out.
good timing though. My old 200 Ocean pro gave up the ghost 6 months ago. This should move my 215 Explorer along nicely.
thanks for all the help
Sig
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Old 05-14-2019, 08:19 AM
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Originally Posted by alloyboy View Post
1998 S250TXRW. Complete engine ID is 61AX 101471.

Perhaps the markings on the CDI are on the other side of the device.

Here is the parts catalog for your motor but buy parts from Andy at www.simyamaha.com or Ole at https://www.parkeryacht.com/

https://www.boats.net/catalog/yamaha.../1998/s250txrw
oh my
Bless you and thank you. Now I can go to work. Could swear I recall him talking about it being a 2000. But I'm happy and grateful for what it is.
Thanks!
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Old 05-14-2019, 08:49 AM
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pre mix and forget it.
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Old 05-14-2019, 08:55 AM
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Originally Posted by trollme View Post
unfortunately the oiling system has been removed. If all checks out. I will invest in a new oiling system. No I'm not afraid of oil injection. When property maintained your good. For now it will be the basics. Just like to know the exact year and model for ordering replacemt parts. I will figure it out.
good timing though. My old 200 Ocean pro gave up the ghost 6 months ago. This should move my 215 Explorer along nicely.
thanks for all the help
Sig
if the oiling has already been bypassed, nothing wrong with premixing and running! at least you know the oil is getting where it needs to go!
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Old 05-14-2019, 08:57 AM
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Originally Posted by trollme View Post
unfortunately the oiling system has been removed. If all checks out. I will invest in a new oiling system. No I'm not afraid of oil injection. When property maintained your good. For now it will be the basics. Just like to know the exact year and model for ordering replacemt parts. I will figure it out.
good timing though. My old 200 Ocean pro gave up the ghost 6 months ago. This should move my 215 Explorer along nicely.
thanks for all the help
Sig
pre mixing is fine. Like I posted we did it. You know you will always be oiled that way.
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Old 05-14-2019, 10:38 AM
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Our OX66 smoke like a cigar on cold start. We use Pennzoil Semi-Syn for 17 a gallon off Amazon- delivered. Works great
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Old 05-14-2019, 12:31 PM
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My 2001 ox66 250hp model # is: SX250TXRZ

SIM has great parts diagrams, Just keep the pre-mix and enjoy.
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