2 stoke mix?

Discussion in 'Battle Scooters' started by monkeywaythere, Dec 2, 2009.

  1. monkeywaythere

    monkeywaythere Scooter explorer

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    hi people hope some can help i have a 1998 liquid cooled pug speedfight
    it has a polini 70kit on 360degree race crank polini race head race exhaust delorto race carb gear up kit multivar ect ect the prob is i now have to mix the petrol and oil so what should i do it to?
    been looking and for every 1ltr use 33ml of oil is this right ?
    cheers in advance.
    stuart
    #1
  2. B02S4

    B02S4 Aye

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    Greetings Stuart, debating premix ratios are sort of like engaging in religious or political discussions.

    Your current mix is approx. a 30:1 ratio and that is a reasonable ratio to run. I personally would not go to a higher ratio (less oil per unit of fuel) than that for a performance 2T motor.

    Most performance 2T motors will do just fine on a 20:1 to 30:1 premix ratio, with a good synth, properly jetted.

    Keep in mind that all other things equal, as a general rule the more oil you premix (that is, the more oil you mix with a given volume of fuel), the leaner your air/fuel mixture will go on a relative basis.

    Just as important, what specific oil are you using?
    #2
  3. monkeywaythere

    monkeywaythere Scooter explorer

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    Hi and thanks for the words of wisdom. I'm using castrol actevo its synthetic oil but will be running rock oil (strawberry smell) when i finish this bottle. its Putoline "strawberry scented TT scooter" 2 stroke oil. that too is fully synthetic.
    should this be ok?


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    #3
  4. B02S4

    B02S4 Aye

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    I'm not familiar with that stuff, what is it rated as?
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  5. brockster

    brockster Despair & Repair Garage

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    I've been using the Motul 800 Off-Road version since my engine was rebuilt. I premix since it's not an oil-injector engine.

    No soft or hard seizures in the engine at all. I'm running roughly 2.5% to 3% range. I can tell when I'm closer to the (recommended) 2% mix because the engine note sounds edgier and flatter.

    My only issue is that the oil costs about $15.00 a quart.:huh But it's cheaper than a rebuild.
    #5
  6. monkeywaythere

    monkeywaythere Scooter explorer

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    not shaw what you mean by rated as? if you google it you will find it ,all i know is that a lot of off roader use it and they seem not to have any problems with it.
    I have done a bit more research and have been advised to use 35-40ml per ltr of fuel. Got to look after this engine doing over 3000miles june july time in 7 days and in jan/feb doing 500+ in 2 days.
    The whole scooter is geared up for long distance touring (or will bewith in the next week or 2!)
    #6
  7. B02S4

    B02S4 Aye

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    I was referencing the API or JASO certification. Perhaps you could google it also, eh?:dunno
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  8. monkeywaythere

    monkeywaythere Scooter explorer

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    Hi there mate just had a look and found a thing that said it was
    JASO FC + pre-mix & injection recommended application: Road and Race does that mean any thing?
    #8
  9. B02S4

    B02S4 Aye

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    That is good stuff. It will be fine. When it comes to 2T's it is best to use a good full synthetic oil.
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  10. B02S4

    B02S4 Aye

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    So what?
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  11. brockster

    brockster Despair & Repair Garage

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    Go ahead and put bottom-feeder oil in your scooters if you want.:norton

    I'm going to have a LOT less carbon buildup and other contaminants on my piston and in my cylinder.

    Motul 800 has worked perfectly for me so far and I am loath to change to anything else - let alone trolling motor oil sold by Wal-Mart.

    Just trying to ride through the parking lot without getting clobbered by a mouth-breather is a mini-adventure...
    #11
  12. B02S4

    B02S4 Aye

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    That is simply incredible.

    What racers do you know that run such absurd ratios?
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  13. brockster

    brockster Despair & Repair Garage

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    50:1 is 2%. Which is what I am supposed to be using since break-in.

    So that ratio doesn't seem too far out.
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  14. B02S4

    B02S4 Aye

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    You can run whatever ratio you want, it's your motor, however as a general rule you're not going to get max power at that ratio, presuming you run pre-mix only. A 50:1 mix with a decent 2T oil is probably going to be just fine if you don't routinely stress the motor.

    My comment to the other poster about what I consider as an "absurd" 100:1 ratio was in the context of racing small-bore 2T aircooled motors & max power generation. I personally wouldn't intentionally run that ratio in a weed wacker. That said, YMMV (your mixture may vary).
    #14
  15. monkeywaythere

    monkeywaythere Scooter explorer

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    So the original question will i be ok mixing 35ml to every 1ltr of fuel?
    stuart
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  16. B02S4

    B02S4 Aye

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    As was already asked & answered, yes.
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