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While unsire of exactly what you mean, I am pretty sure you mean the "premix" gas-oil ratio. Depending on the oil you use and whether you had work done to the bike or not can change this answer. Stock YZ 250 premix with your typical "Yamalube 2R" is 32:1. Meaning that you can mix one bottle of oil (16oz) to 4 gallons of gasoline. However if you use a high quality, full synthetic oil "Belray H1R" you can go as high as 50:1. Meaning less oil than the 32:1 mixture. This mixture is approx. 8 oz. oil for 4 gallons of fuel. I would highly recommend using a 32:1 ration no matter what kind of oil you use, even though the manufacturer states you can use 32:1-50:1 oil to gas ratios.
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Fuel oil ratio for Yamaha yz 250?
32.1
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