Yamaha OX66 Full Disassembly - Rebuild Outboard
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- čas přidán 24. 08. 2019
- This is how to disassemble a Yamaha OX66 outboard. The Full disassembly for rebuilding an outboard. This OX66 dropped a cylinder. It will be rebuilt instead of putting on a new powerhead. If you are looking to rebuild a Yamaha Outboard, hopefully, this video will help. Also explained is, VST tank, O2 sensor, and LP fuel pumps. Among other things like the lower unit.
Yes, it has happened again. I had a lot of requests last time on showing the total disassembly so that is what I am doing this time.
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So far this is the best outboard tear down I've found online. I just got a grady white with a motor that is going to need work so thanks for the walk through.
A picture is worth a thousand words and a video is worth a million! I just bought one of these and this video walked me through where things are that I need to service! Thanks for making this video. Very helpful.
Glad I could help!
Best video I have ever seen regarding Yamaha OX 66 Service, Great Job, thanks!
Wow, thanks!
Just got a 2001 200HP OX66 and having bogging issue and chasing fuel pumps and injectors. This video has helped me learn a lot on how this system works!
Glad it helped. Check Spark plugs. Those are usually the cause of it bogging if it's not a dirty VST filter.
@@CatchingColorado Thanks for tip. I went over the entire fuel system sevferal times and even had injectors professionally cleaned. I recently changed the head gaskets and got about 15 hours out of motor before cylinder #6 on top left made loud knocking sound and got stuck 12 miles offshore... Got towed-in for a long day and watching all your re-build videos over again!
As someone who's fairly familiar with motorcycle 2-strokes and automotive 4-strokes, it is WEIRD seeing those two worlds smashed together in an engine like this. I'd love to have a closer look at the ports on this thing. The spacing between the cylinders has got to create some really interesting challenges for the transfer ports on a loop-scavenged engine like this.
I'm not a fishing fanatic but just based on the time and effort you put in this video for us novices, I'm freaking subscribing. you should do more how to videos
Thanks for the sub!
I'm doing the same. Great video.
came here to say thank you for making this video, it's awesome.
Glad you enjoyed it! Hope it helps
nice video this is what i might have to do after my 200 hp 1995 yamaha outboard steering arm bracket rotted away (broke) a lot of work
perfect video great work ethics. loved it!
Thanks Sean! I needed this video two years ago so I thought I had to be the guy to make one.
Yes, great video !!
Glad you liked it!
Thanks for the tear down video, Do you have a video of putting it back together?
Thanks so much
Thank you awesome video
Glad you enjoyed it
liked the video but was hoping to see exhaust removal, any suggestions on removing these without snapping them all ??
heat, torch, penetrating oil ?
mine all seem like they will snap.
thanks !
Thanks for taking the time to make this video! I just pulled the head off mine cause cylinder 2 detonated. I assume from a bad injector. I wish the cylinders would come off the block so I didn't have to pull the entire power head. Sure complicates the job.
Did you get her fixed?
Fantastic video!! I have the same motor and managed to replace two pistons without removal of the engine!
How the hell did you manage that? I don't think that's possible with this engine.
COfishBRO My local mechanic in Florida did the job and honed out the chamber at the same time !
I changed two pistons out on the ocean while trolling for dolphin. Runs like a top
I would like to know how myself. My mechanic said it can probably be done. I need to change one piston, rings and hone the cylinder. But I see when you remove the balancer there is a plate that looks like it bolts on the crankcase and the powehead making it impossible to remove the crankcase without removing the engine.
kracker1977 Hi ....Unfortunately I was not present when my mechanic removed these pistons , but he definitely did the job without removal of the engine and the total job was done within a day for each piston !! Apologies for the lack of help...
where did you buy your parts, and how much did it cost to rebuild it
22:40 are those vacuum lines or re-circulation lines leading back to the intake manifold? i have the exact same ones on my 3.0 liter looper evinrude and they have check valves in them. awesome video!
Good question but I think Vacuum lines.
i just got my power head and i'm having problems installing all the electrical back as it should. I wish i saw your video before i removed all the electrical before i got the new power head. now I'm stuck as to install all the electrical correctly..
You can do it!
Question for you.I have a 2000 Pursuit 2870 with Twin 225 OX66 Yamahas. The engine overheat alarm occasionally goes off on the starboard engine. We have replaced (with Yamaha parts) - the water pump, the PRV, the thermostats and have cleaned the O2 sensor. The alarm only goes off in the channel at low speed after running for 10 minutes or so. Any suggestions?Mark
I have no idea... I never had overheating issues. Lots of sensors to check that might be throwing that alarm though.
How are your T stats?
Do you think you could have disassembled without the engine stand? Im starting my breakdown this afternoon. Thank you so much for this video sir!
Awesome video bro
What is the vacuum line for the shifter? I looked like yours ran into the control tube. Then where doses it go?
On to the block at the intake.
Good 👍🏻 video
Thanks for the visit
where do i get the stand mount plate for my 250 hp Yamaha 0x66 outboard? where to buy?
Did you find the cause of the motor blowing up ??
Congrats on the engine rebuild! If I was you I would disconnect the Precision blend system on that engine and just mix the gas in the tank! My first Yamaha 200 blew up because of this problem and so I immediately disconnected on the one I have now and haven't had any problems at all! Good luck fishing and congrats on the rebuild she really ran good!!
Great point!
If the oiler goes out these Yamaha outboards it will over oil and smoke like tar kettle. It won’t blow up. I’ve been running a 2003 Yamaha 150 VMax for 19 years. You have to do regular service on them and not wait for something to tare up. They have a small filter on the bottom of the oil revisor that I change every year. Service is the key to making any outboard motor last.
@@CatchingColorado Leave it on the motor. It was designed to work at its best with the oiler in tact.
other than a new piston, what parts did you replace? any bearings? rings for all cylinders? trying to figure out what parts should automatically be replaced if you go through the trouble to tear an outboard down.
All bearings, rods, rings, cylinders, gaskets, O2 sensor, and filters.
@@CatchingColorado Did you use aftermarket kit or all OEM Yamaha?
So what happened did you rebuild it? And if so what was the total damage. I have a 200hp basically same motor 95 psi per cylinder thinking about doing a rebuild. Got a qoute 7 grand. Either that or buy a 4 stroke 30k i think id rather rebuid this one if necessary lol.
How did you adapt the engine stand to fit the block?
Long hex bolts, then tons of washers between the block and the stand. This helped make a tight connection and gave room for other components.
Where do you find a Cresent ratchet at? Never heard of one!
Dude it will change your life. Harbor Freight has em cheaper than anywhere else.
What bolts did you use to mount the engine stand plate to the engine?
Long carriage bolts with washers for the section of bolt that didn't have threads.
Get a Holley electric fuel pump with a regulator, remove and block the ports on the diaphragm pumps.
I did that on my Johnson and never looked back.
Too many moving parts that can fail.
Im intrigued. Can you tell me more? cofishbro@gmail.com
I know its been 2 years since your video post but I was wondering how much money you had into the rebuild? I know you needed a new crank, gasket sets, O2 sensor, machine shop work , etc. I have a 1999 Ox66 that I bought brand new 23 years ago and spin wrenches on it myself for basic maintenance. Has perfect compression on all cylinders so far. I really like these 2 stroke 200HP and am weighing whether to repower with new engine in case this one grenades or do the rebuild. Thx for the video !
All in, I think about 5k. But a big cost was the crank, another was shipping the block for machining, lastly, I am picky about parts and bought good stuff. You can do it for less. Very easy motors to work on if something ever does happen.
Great video
Thanks!
what engine stand did you use? looks like the $99 one from harbor freight maybe?
Correct! It worked fine!
I am considering buying the exact same kind engine, 99 V200TLRX or I am thinking if I should spend few grand more to get a newer more fuel efficient 4-stroke.
What do you think, would you recommend this engine? What are the things I should look for in this engine when going to inspect it at the seller?
I think a newer engine is always a good choice but these engines are practically bulletproof. You need to check compression on each cylinder, I would look at the fuel filter and make sure the ring at the bottom isn't floating (indicates water). Drain a tiny bit of lower unit fluid and make sure it doesn't look frothy or milky (water in lower unit). Make sure it trims up and down well and with ease. Always water test the engine if possible
I have this exact same engine and model year 1999. I had my engine blow up on me while using it and had it rebuilt. I paid $5,000 to have it redone over 10 years ago. After wards, I used it but then had to stop using it. Finances got cut when I lost my job and was married so essentially this boat has sat unused for 12 years now. Hard to imagine but it is true. I ran the gas out of it when I first parked it. It ran fine when I stored it but after all this time, what would you suggest I do to get it back up and running? I have never cranked it one time in those years. Thanks for any suggestions.
Just clean out the fuel line, check your plugs, replace filters, and get a good battery on her. If she is hard starting you can use a tiny bit of starting fluid in the throttle body but don't let her get reliant on starter fluid
@@CatchingColorado ok, thanks for the input.
👌👌👌
That is not a vacuum for the shift, it is the speedometer tube.
Wish I could send you mine
Wharever happened to this motor. I found video where you were going to epoxy some damage but couldn't find any rebuild video. Just curious
I am still using it to this day. It does amazing still. I used JB weld to seal a small hole in the crankcase. It's held great.
what do you think caused the cylinder failure?
Carbon build up on rings after 20 years of use. Or just a random detonation
Is there a video of the rebuild?
Unfortunately no. But I can answer questions.
@@CatchingColorado Hey man great video. I have low compression on one cylinder 115 115 115 110 100 80. so planning to rebuild the motor. I am a very experienced two strokes motorcycle mechanic and know how important are the bearings. What brand bearings did you used? How many hours on your rebuilt motor now? Thank you.
@@trustytrucking9917 check out the WSM kits. They are reliable and well known for aftermarket parts. I have 20 hours on the rebuild. but it was hard to get out this year with things going on
Did you rebuild this ?
Yep. She runs awesome
What was the outcome of the motor? Repaired, trashed?
Totally repaired. Still using it today
@@CatchingColorado what caused the failure ?
Did you have to sleeve the cylinder?
No. Just bore .010"
Did you bore the bad cylinder only or you had to bore all cylinders and replace all pistons?
@@Victorperez-fr7yh bored two cylinders. Honed the rest
The reason I asked was that I wanted to rebuild a motor with a scared cylinder and the mechanic told me I would have to buy a new set of pistons. That I couldn't bore that one cylinder only. I would have to bore all of them because I couldn't have different piston sizes. Just wondering if it was true.
@@Victorperez-fr7yh with most engines yes. With these they are done this way all the time. You only need to bore the bad cylinders
Wonder why these engines always fale?
Is there anyone who knows?
You want to sell the crank because I no you didn’t put it back together and the heads
I had a crankshaft company check it out and they junked it.
do you think that taking a video of yourself disassembling is worth it, rather than taking pictures?
I do. Video has so many more angles. I have used it multiple times to see where things were routed.
You have done this before lol...
If the engine is seized the prop won’t turn ..... try agin
Explain?
Put it in neutral and the prop will spin regardless of the engine
@@DirtMcGert29054 Truth. I talk so fast through these things. It's not always what I mean. Meh, you know what I was saying.
@@CatchingColorado I hear ya , I get paid to find problems that have been over looked , so its nothing personal
Any idea what blew the motor? I just got a similar engine
I can’t find anyone to look at mine..hah
Great vid also!
3.1 is not a 200 its either 225 or 250
2.6 is the 200
V200tlrx 1999. It is indeed a 200
@@CatchingColorado
I did not know they made a low hp version you are correct
I own a 2005 OX66 2.6 200 and
2004 OX66 225 both SX series
They are great motors i think the best 2 strokes ever
@@drifter9425 ever since the rebuild mine has been Rock solid.
@@CatchingColoradostill going strong ?
One thing I've found out was the Yamalube is a bad 2 stroke oil it's so bad you need ring free in it
I believe it's one of the reasons for failing
I've been using Toyhatsu Full Synthetic for 7yrs and I put ALOT of run time on mine every year and I run it wide open a fair amount
O2 sensor and plugs always look clean in fact I've never had to clean the O2 sensor since I bought it used
I did however start off day one with a new one and plugs as well as a clean VST and ZERO issues
Take the fly wheel cover off before you pull the starter(tooless) , your making this up as you go a long , clearly spent too much time the forums
Never claimed to be a mechanic. Not charging customers either. This video is free to use as an educational tool. But for a backyard mechanic, and using forums, youtube, service manuals and advice of local mechanics she runs like a top, soooooooooooooooo
@@CatchingColorado there will always be haters! Thanks for the video. I have started doing some and respect the amount of time that is needed to post this here for free! I do all my own work on cars and equipment. Was a little scared to crack off into this thing but now that I have seen the video I will rip it apart. Did you find a good source for all the torque specs and patterns?
@@92greymare shoot me an email at cofishbro@gmail.com and I will send you the service guide
@@92greymare updated the email. Stupid Siri jacked it up
@@CatchingColorado don’t pay attention to haters. The vast majority appreciate what you did by posting a free video. THANK YOU SO MUCH.