i need help with my 2 stroke yamaha outboard

Discussion in 'Outboards' started by chazwaza, Feb 16, 2005.

  1. chazwaza
    Joined: Feb 2005
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    Location: united kingdom

    chazwaza New Member

    hi , im charlie

    i need to know what ratio of oil to petrol i need to use in my yamaha 2 stroke 15hp outboard engine please help me :)
     
  2. Alan Power
    Joined: Jul 2001
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    Alan Power Junior Member

    Wat year?
     
  3. tom28571
    Joined: Dec 2001
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    tom28571 Senior Member

    All 2 stroke Yamahas that I have used need 100:1 fuel oil ratio. I find that it pays to also add a little of a product they call Ring Free to the mix. The very lean ratio can cause piston rings to freeze up.
     
  4. steigermike
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    steigermike Junior Member

    tom is right and the ring free is good advice, also if your premixing its best to be a little over than under.
     
  5. FAST FRED
    Joined: Oct 2002
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    Location: Conn in summers , Ortona FL in winter , with big d

    FAST FRED Senior Member

    Be aware that the bigest reason for DEAD outboards is old premix gas.

    ONLY mix enough for the day or weekend , and when finished , pour the mix into what ever gas auto you have.

    The octane rating of gas declines rapidly with the addition of oil , and many outboards NEED good octane to survive.

    Most new cars have detonation sensors so can eat last weeks gas with no prpblem.

    Also be aware that there are many types of 2 stroke oil ,
    ONLY use the stuff made for outboards, any brand is OK .

    FAST FRED
     
  6. Mick Folan
    Joined: Feb 2005
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    Mick Folan New Member

    petrol onboard

    Following on from that i have a two stroke 15 hp mariner as an auxillary for my Perkins 4108 how long would the petrol last if i didnt add the oil mix.
     
  7. Alan Power
    Joined: Jul 2001
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    Alan Power Junior Member

    The petrol would last a lot longer than your engine with no oil :confused:
     

  8. gonzo
    Joined: Aug 2002
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    gonzo Senior Member

    The problem with old mix is separation. Two stroke petroleum based oils have zinc as an additive. After a couple of months it sediments. That is what causes that jelly looking stuff. It will clog the fuel pump and the oil injection orifices. A syntetic oil prevents that. It is not a suspension but a complete solution.
     
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