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The VRO system, that came on the engine originally, varied the ratio from approximately 100:1, to 50:1. Provided you are not using the OEM injection system, a mixture to the richest ratio, 50:1, would be best. This is roughly one pint of 2 cycle oil, to six gallons of fuel.

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Q: What is the fuel mixture for a 1990 Johnson 90 horse?
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