2 stroke mix ratios? new or old "oil"?
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Thread: 2 stroke mix ratios? new or old "oil"?

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    FBM
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    2 stroke mix ratios? new or old "oil"?

    Quick question on 1960s Benelli 2 strokes.

    What is the recomended ratio using a modern quality synthetic premix oil?

    What is the recomended ratio using a modern castor based (Maxima 927) oil?

    I'm currently running a modern synthetic at 32:1 (only because that's the mx used in my string trimmer, and its easier to fuel from the same can!)

    I think the "OLD" manuals called for mixing gas with 30wt motor oil at 20:1 (am I correct?)

    Any other recomendations on what premix oil to use? and why? and at what ratio?

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    Senior Member dobbinuk's Avatar
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    Usually 25:1. But with synthetic oil, I am currently up to 30:1 and looking to drop a bit further.

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    Senior Member R Powell's Avatar
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    I have just seized my Benelli 125 enduro running it at 32 to 1, its mashed the piston and barrell

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    FBM
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    Yikes! 32:1 must be not enough oil then. 25:1 or 20:1?

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    Senior Member dobbinuk's Avatar
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    Quote Originally Posted by R Powell View Post
    I have just seized my Benelli 125 enduro running it at 32 to 1, its mashed the piston and barrell
    What oil were you using please?

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    Senior Member R Powell's Avatar
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    i was using silkolene oil mixed in a can and measured the oil in a kitchen measuring jug. The piston seized in a big way will stick to 25 to 1 in future its cheaper than a new barrell and piston!

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    Running my 1980 125 twin at 40:1 on Rockoil seems to like it certainly smokes healthily .... right or wrong?

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    Senior Member bennyandthejets's Avatar
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    Quote Originally Posted by R Powell View Post
    i was using silkolene oil mixed in a can and measured the oil in a kitchen measuring jug. The piston seized in a big way will stick to 25 to 1 in future its cheaper than a new barrell and piston!
    Yeah but Silkolene what? Was it mineral oil, or synthetic? They are very different, and not to be confused, or mixed. Mineral oils are usually run at 20:1 or 25:1, but fully synthetic 2 stroke oil is designed to be run at up to 50:1. I used to run my Fantic & Bultaco trials 2 stroke singles at 45:1 on synthetic, with no problems, and very little smoke. I did run my Greeves trials on Castrol R40 castor oil at 20:1; some people complained about the smell, though! I loved it!

    Cheers
    Ian

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