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What is the oil-fuel mixture ratio for a 1990 Yamaha 70 hp outboard?
Wiki User
∙ 15y ago
If not using the oem oil injection system, use a 50:1 ratio, one pint of 2 cycle oil, to six gallons of fuel. If operating with the oil injection system, supplied with the engine, no additional oil is required.
Wiki User
∙ 15y ago
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