Pardon my ignorance

[SidnMisty]

My husband is having problems with
'93 yamaha 85 hp.....he's pretty sure it's the gas mixture although it is 50:1, it's running rough. I think it's because it wasn't mixed in a separate container....it was put in at the gas station (oil, gas,oil, gas)
does that matter, and does that cause excess bluish smoke?
and does the brand of marine oil matter?

 

[rodbolt]

Re: Pardon my ignorance

what can happen is the oil wont properly mix with the gas that way.
you may have a very rich oil mix.
sometimes the oil will sit at the bottom and the fuel pickup will draw mostly oil.
pre mixing is a pain but it must be done correctly and adding oil directly to the fuel tank usually leads to heartaches.

 

[SidnMisty]

Re: Pardon my ignorance

Thanks for your quick response, Rodbolt.

Also, what brand of oil do you recommend?

 

[JB]

Re: Pardon my ignorance

I doubt that fuel mix is your problem, Misty. If you poured it at the gas station it should have been well mixed before you got to the ramp.

"Rough" is a pretty subjective term. Could you be more specific?

 

[dengle]

Re: Pardon my ignorance

Yes, unless the boat was filled with gas and oil while in the water sitting dead still and then started I think your gas and oil is mixed plenty. I fill up with gas and then add appropriate amount of oil at the pump. I am sure with all the bouncing on the way to the ramp, or home and to the ramp the next time it gets plenty of sloshing and mixing.

 

[BruceAML]

Re: Pardon my ignorance

What brand of oil is your husband using? What kind of gas tank is he using? The Yamaha factory gas containers are actually a Metric measurement and he may not be using the correct amount of oil. Have you tried using a different gas tank?

 

[bowhuntrrl]

Re: Pardon my ignorance

What brand of oil is your husband using? What kind of gas tank is he using? The Yamaha factory gas containers are actually a Metric measurement and he may not be using the correct amount of oil. Have you tried using a different gas tank?

What does that have to do with anything ??? You put in X amount of gallons from the pump and then the proper amount of oil for that many gallons. I don't really see what difference the marks on the gas can would make.

 

[deejaycee_2000]

Re: Pardon my ignorance

50:1 is perfect the best oil is yamalube ..... maybe time for a carb rebuild and sync ....

 

[BruceAML]

Re: Pardon my ignorance

Here is something from the Yamaha Technical Guide.
When the engine exhaust smoke is too thick at idle, check the following:
Quality of oil being used.
Leaking fuel pump diaphragm.
Leaking exhaust gaskets.
Carburetor synchronization and idle fuel adjustment.

The reason I asked what type oil was being used is because Yamaha mentions that as a cause of excessive smoke.