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Probably 50-1 is the correct mix, but! You do not provide the year, so I suggest you call your local Mercury dealer to be 100% sure. Fuel/Air mixture is critical. Also ask about which octane fuel you should use. it may require 89 octane fuel.

Probably 50-1 is the correct mix, but! You do not provide the year, so I suggest you call your local Mercury dealer to be 100% sure. Fuel/Air mixture is critical. Also ask about which octane fuel you should use. it may require 89 octane fuel.

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