100:1 mixture

Discussion in 'Outboard Maintenance' started by AfterHours2, Oct 6, 2012.

  1. AfterHours2

    AfterHours2 Stripper in my own Mind!

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    Who's been running this on their 2 strokes? My Yamaha has it posted on the motor that it is the proper ratio but after talking to a few people, many claim it is still too lean and need to go back to standard 50:1. Cut and Creek, feel free to offer your expert opinions. Thx...
     
  2. cutrunner

    cutrunner Cert. Yamaha technician

    I had a 25 yam 2 stroke on my old skiff and i mixed it 75:1.
    I figured somewhere in the middle couldnt hurt.
    I personally know Yamaha does a LOT of r&d on their motors before letting them go public, and i havent seen a 25hp blow up ever (minus the older 3 cyl models).
    I dont think you will hurt it at 100:1 at all, especially if your using good oil.
    Now if your using cheap oil... I would 50:1 it.

    Hope that helps
     

  3. anytide

    anytide Administrator Staff Member

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    thats what i was thinking ,too much you get a little smoke -maybe need new plugs.
    but not enough and it'll burn up.... i always mixed a little heavy on oil...
     
  4. AfterHours2

    AfterHours2 Stripper in my own Mind!

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    Thx for the info fellas. I have only used Yamalube on the motor and the 75:1 sounds a little better. I just like how clean the motor runs right now but better safe then sorry. Maybe I'll try 79:1 ;D
     
  5. Rediculous

    Rediculous Boozle on...

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    I use amsoil saber, 100:1. I do mix it a little heavy, probably 85:1. I'm no mechanic, but I've been doing it for about a year and so far so good. It does run a hell of alot smoother, than when I run out and I have to use regular 50:1.
     
  6. Creek Runner

    Creek Runner Well-Known Member

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    I had a 15hp and ran it 100:1 it had over 500hrs when I sold it and it still was running strong. Anything over 15hp I would run 75:1 or even 50:1 anything under and 100:1 is fine and is acutally better for the engines.
     
  7. Sheremeta

    Sheremeta Well-Known Member

    My 25 Yamaha 100:1

    My 50 Yamaha 50:1


    Per Yamaha owners manual
     
  8. meterman

    meterman I Love microskiff.com!

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    my 90 yami is oil injected 2006 , and that it set 100 :1 from fac.
     
  9. Creek Runner

    Creek Runner Well-Known Member

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    Your oil injection is variable, it changes as the motor increases and decreases rpm's.

    BTW  C90hp Yamaha's meaning non oil injected models are pre-mixed 50:1 ratio.

    Straight from Kennesaw. ;)
     
  10. meterman

    meterman I Love microskiff.com!

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    thanks for that clearing up
    mac
     
  11. cutrunner

    cutrunner Cert. Yamaha technician

    Creek:
    You up at school? Go to the tilted kilt!
     
  12. Creek Runner

    Creek Runner Well-Known Member

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    Buddy the Tilted Kilt and I are one!!! lmao
    We also have one in Jacksonville so it's like I never leave! :D
     
  13. cutrunner

    cutrunner Cert. Yamaha technician

    Lol. Whats the drive from Jville to kennesaw?(hours)
    Our drive blows..
    Too bad its not in miami, i might not show up the next day ;D
     
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