Found this on the Yamaha Outboard site:
Question
What octane fuel should I use in my Yamaha Outboard?
Answer
Most Yamaha outboards are made to run on 86-octane fuel (R+M/2 or “pump” octane). There are some exceptions which are designed to run on 89 octane. Those engines are the F250, F300, F350, and Four-Stroke Sport models.
I have a 1993 55hp Yamaha, when I bought it (6wks ago) the seller told me all he used was 93 octane.
Should I continue to use 93, or can I use 86 octane??
Question
What octane fuel should I use in my Yamaha Outboard?
Answer
Most Yamaha outboards are made to run on 86-octane fuel (R+M/2 or “pump” octane). There are some exceptions which are designed to run on 89 octane. Those engines are the F250, F300, F350, and Four-Stroke Sport models.
I have a 1993 55hp Yamaha, when I bought it (6wks ago) the seller told me all he used was 93 octane.
Should I continue to use 93, or can I use 86 octane??
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