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This depends on the oil you're using and your jetting setup. You can run anywhere from 20:1 (20 parts gas to 1 part oil, i.e. 20 liters of gasoline, one liter oil mixed in a jug) to 50:1 and even 100:1 with some of the newer high-tech oils (Amsoil Dominator, etc). I believe the sticker on the fender of my YZ80 said 32:1. I ran a little on the rich side, closer to 30:1 or even 28:1, simply because I believe that more oil means better lubrication means longer life, and I haven't had a piston burn up on me yet with this mindset.

So, for most people, I would suggest running 30:1.

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14y ago
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Q: How much oil and petrol do you mix with a yz 80?
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