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post #21 of 41 Old 09-13-2012
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Re: Yamaha outboard no water through tell tail

Hello,
I had the same issue recently and this is what fixed it:

I did poke around a bit into where the water usually spits out, then I held the hose at full blast right up to that same outlet where the water usually spits out. I backflushed it like that for about a minute or two, and saw a good amount of little bits come out the propeller area.

Now it works just as good as it did before it got plugged up.
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post #22 of 41 Old 09-13-2012
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Re: Yamaha outboard no water through tell tail

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Originally Posted by sgjfrods View Post
Could be plugged internal cooling passages. That was the problem with my Yamaha 2hp when it didn't spit water during its test run this spring. Impeller was fine.

For example how did you clear the internal cooling passages?

Thanks very much
Required removing the head so the passages could be cleared.
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post #23 of 41 Old 09-14-2012
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Re: Yamaha outboard no water through tell tail

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Originally Posted by sgjfrods View Post
.....I am new to outboards and have limited tools, so If i do this I could get myself in a bit of a mess.....
This is the problem. Your imagination and concern over the unknown are making more of this very simple problem.

You only need a very basic set of tools and you should have them anyway. Even just a kit would be a fine way to get started.

Remind yourself of this. If you take it apart and get stuck, then paying someone to put it back together is not going to be any more expensive than having them do it in the first place. With this courage, you are going to find that you get it done 99% of the time. For the 1%, you've saved plenty of money on the rest to afford the help.

Good luck.

p.s. google and youtube can really be your friend. I guarantee there are vids of other people doing their impellers that would give you more confidence. Here is just a random one that I found:


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post #24 of 41 Old 09-14-2012
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Re: Yamaha outboard no water through tell tail

when my outboard did that, I just cleaned the discharge tube from the water pump - problem solved
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post #25 of 41 Old 09-14-2012 Thread Starter
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Re: Yamaha outboard no water through tell tail

Therapy, yes that is my motor.
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post #26 of 41 Old 09-14-2012
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Re: Yamaha outboard no water through tell tail

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Therapy, yes that is my motor.
I went through the diagrams trying to find the path of the pee tube and could not find it.

I can usually find a .pdf shop manual for free but could not for that motor. That way one could give more specific advice.

I am with the camp of following the pee tube to the engine/pump housing and disconnect and flush. Bugs make nests that act and look like cotton plugs.

If that does not work then the impeller change.

I have worked on all my outboards and other motors since I first left home (a monetary necessity) so I would just go for the impeller anyway since it has been sitting so long.

Oddly enough the hardest part of changing an impeller for me has been re-aligning/re- adjusting the shift rod. (mark it before loosening it)
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post #27 of 41 Old 09-14-2012 Thread Starter
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Re: Yamaha outboard no water through tell tail

Thanks for your replies,


Out of interest does the prop area of the outboard have a different oil supply to the main engine?

If so what type of oil is in the prop area of the engine? or a common type?

Thanks very much,

James
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post #28 of 41 Old 09-14-2012
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Re: Yamaha outboard no water through tell tail

Typically 90w lower gear unit oil. if you look on the side of the leg, just above the prop, you should see two screws. You open the top to allow air to enter as it drains from the bottom. Then you refill by pumping oil into the bottom until you see it at the top. The pump fits onto any 1qt oil container and costs about 10 dollars.

Again, I'm sure there are YouTube vids to see someone else do it.


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post #29 of 41 Old 09-14-2012
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Re: Yamaha outboard no water through tell tail

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Originally Posted by therapy23 View Post
I went through the diagrams trying to find the path of the pee tube and could not find it.
Definite contender for quote of the week.

Don't know if it helps but nigel1 on the ybw forum has a pdf of the service manual that he says he's prepared to share.
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post #30 of 41 Old 09-14-2012
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Re: Yamaha outboard no water through tell tail

Yes the 2 oils are different.

Engine oil is well... engine oil; follow the mfrs recommendation. A 2-stroke doesn't have engine oil, it arrives with the gas/oil mix and 30% of it goes out the exhuast, unused.

The oil in the prop area is called gearcase oil and the system (called the 'lower unit') is completely separate from the engine. In my limited experience, gearcase oil is all the same but they use a lighter (less viscuous) formula in colder climes.

The above represents about 25% of my OB engine knowledge.

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