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I have a 9.9 1993 4 stroke Yamaha outboard long shaft that leaks a small amount of oil out the 1/8 inch hole in the back of the motor, even when not running. It overheated once and I had the impeller replaced and it started leaking after that. The motor runs good and has less than 50 hours on it. It is a T9.9 EXHR, sn-785926.

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6ya6ya
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Posted on Jan 02, 2017

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espressonist
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SOURCE: i have a yamaha 2

On the tachometer back you have secured a wire thread just like the one from the brakes of a bicycle. The other end of the wire is secure to the engine. This wire complete, need to be replaced.

As a test first disconnect it from the tachometer and see if ok if not then the problem is with tachometer.

Posted on Oct 03, 2010

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walesarumi
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SOURCE: I have a 1993 Yamaha 4 stroke outboard long shaft

Hello,

the problem should be from the oil seal, the oil seal must have slacked or worn out, so it cannot withhold the oil and that's why it is dripping.

Trace where the oil is dripping from, loose that part and you will see what's making it leak, seal that area/part up or replace whatsoever oil seal that is slack or that is making it leak.

You might be needing the help of a repair man if you don't know how to come about this.

Good luck.

Posted on Oct 18, 2010

goldbill
  • 184 Answers

SOURCE: Johnson 235HP Outboard - oil leaking from bottom leg - dark black so picking it is the two stroke oil

most 2 stroke motors will not burn all the oil in the mix and that unburned oil coats the exhaust leg and leaks out the thru hub exhaust and parting line of the lower to the housing. so keep some windex handy and clean it up.

Posted on Oct 11, 2012

Testimonial: "Thanks for your help William. I am new to two stroke outboards so your advice answered a few of my concerns - I have now got my hands on the manual for this motor and are digesting alot more information - they are complicated! Thank you"

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Some links including a video of how to change the filter. In such questions horsepower is useful along with year :>) Oil filters would only be on a 4 stroke though to protect the engine oil. Your two stoke doesn't have filters in the lower unit. There may be a strainer in the two stroke oil tank.

check page 31 here
http://www.yamaha-motor.com/assets/service/manuals/1/LIT-18626-07-03_1415.pdf

Google
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http://www.bing.com/search?q=oil+filter+located+on+a+2004+Yamaha+outboard+two+stroke+motor&form=PRHPR1&src=IE11TR&pc=EUPP_HRTS

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On the lower side of the gearbox,below the line of the prop shaft,you will see a screw that is about10-15mm across.This is the drain for the g/box oil.If you look above that screw about 150mm(6 inches),you will see another screw the same.It may even be marked 'oil level'.Remove them both.
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If its a newer model, a 4 stroke, it'll be injected(Gas and oil seperate)

If you are totally unsure, Consult your owners manual and if you have none, then any Yamaha dealer can use the serial # off the motor to establish any specs on it for you.

Happy boating.

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