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My 99 70hp Yamaha Outboard is not running good at higher speeds and seems to have gas and oil in exhaust.

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Sounds like partially fouled spark plugs. Try replacing the plugs, and do a compression check while all the plugs are out. It should have at least a 110 pounds of compression per cylinder. And they should be with-in 10 pounds of each other.

Posted on May 16, 2017

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Posted on Jan 02, 2017

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I have a 1994 Yamaha 40 horsepower 2-stroke outboard motor turns over won't start doesn't seem like it's getting gas change the fuel line any other suggestions


Try removing a spark plug and make sure you are getting spark. If there is spark put a couple tablespoons of premixed fuel directly into the cylinder before putting the plug back in. It should fire right up, and hopefully will speed up the priming of the fuel system. Hope this is of some help to ya, good luck.

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I just bought my 50cc Yamaha scooter 3 months ago. Top speed was normal around 45km. It runs great .But recently it lost a lot of speed maxing out around 30km.I just got it check out .The spark plugs are...


They build up carbon in the exhaust port, if you take the exhaust off you will probably see the carbon has build up leaving only a small hole.

Scrape the carbon out and give it a start with the exhaust off for a few seconds.
Buy some stainless bolt or nuts to bolt the exhaust back on, as this will need doing again. Try some different 2 stroke oils, the more expensive are not necessarily the best, as they might need higher temps to completely burn.
They can also build up a bit in the exhaust outlet.
I used to own 50 hire mopeds and worked on a few hundred of the competitors bikes and this was the most common problem.
The yamahas used to get to about 55km

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1 Answer

What type of petrol is needed for a yamaha outboard motor horsepower 8?


reg unleaded gas.

You haven't specified as to its year of manufacture, so if its older, as in a 2 stroke, it'll be a mix of gas and outboard oil.

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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The carbs need to be cleaned.There is a high speed jet in the carb that is more than likely stopped up. Jim OMC retired mech.

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Keep an eye on it and put a bucket with paper inside under the motor. You want to know whether the oil is burnt oil from the exhaust or gear lube. You should be able to tell from the color of the oil. Its kind of like soot in a chimney, the exhaust goes through the prop with the oil you added to the gas.

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Hi hoeygatt

Look around your bike near where the throttle cable meets the engine, when you pull the throttle, the cable pulls a quarter circle piece of metal which is connected to a spring, then connected to that should be a screw, that is the idle screw, turn it very slightly, usually clockwise to make the idle higher, and this should sort out the problem.

Please remember to rate this solution as FixYa!

Kind regards
BearWeb

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