Learning that 50-1, 45-1 or 30-1 mix is good depending on the set-up. My question is abit silly but better than doing something wrong. When you say 50-1...Is that 50 liters gas to 1 liter of 2T oil. How about if the gas tank can only consume around 30 liters? how would I be able to mix say 10 liters of gas with how many ml of 2T for testing before jetting. A formula would be nice. I wasn't really good at math in college sorry
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ride it like a horse

Estrol,

The premix ratio is X parts fuel to Y parts oil. You can figure that our by the ounce, or mililiter, or go get yourself a Ratio Rite mixing cup. Takes all the guessing work out of mixing.


Thanks,
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Charles Gallant

so how much 2T should be mixed with 10 liters??? Is there a basic mathematical formula for that? thanks
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ride it like a horse

Estrol,

that all depends on the ratio you want to mix at.

Since I mix at 32:1 I would use approx 312 milliliters of oil for 10 liters of fuel.

I normally do 3 gallons of fuel at a time when racing. This means I would use approx 12 oz of oil for that much fuel.

Thanks,
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Charles Gallant

For calculating your mix with liters... I would use this algorithm

Liters of Fuel divided by oil mix ratio * 1000

So for 10 liters mixed at 32:1

(10 / 32) * 1000 = 312.5

That will give you milliliters of oil needed, or .3125 liters of oil.

Thanks
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Charles Gallant

Copy that! I have printed it out in a large scale. Then added it to my notes folder. I came up with 45ml at 10L at 45-1 ratio. For a 32-1 mix you must have really done all the testing to come up with a perfect set-up. Thank you for the lesson on algorithm. Much appreciated Charles.
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ride it like a horse

going from 45:1 to 32:1 doesn't make much of a difference in jetting. Maybe at most 1 jet size in difference (and most likely not).

The main difference that using 45:1 and not 32:1 is a reduction in the amount of oil to lubricate the engine. I would rather jump a jet size up, run higher amounts of oil. I may be running richer, but I know I will have a well lubricated engine, making for a longer lasting engine.

On my 2001 Honda RS250 I run at 24:1 every time I do a top end, I am amazed at how good the parts look.

Thanks,
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Charles Gallant

I always find it easier to just fix a quantity of oil per litre in your head. So 30ml, 40ml - whatever.[Depending on your ratio]
Than multiply that, by however many litres you put in. Easy!
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