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Most all outboard engines have been designed to run on 89 octane fuel. Given the current gasoline situation however, I recommend higher octane, alcohol free fuels to my customers.
I have a 1972 85esl72 Johnson outboard motor and I use a 50:1 ratio.
Johnson and Evinrude outboard motors use the engine "model" number to determine the year model.
For a 1991 Mercury Grand Marquis : " regular " unleaded gasoline , 87 octane is used for both the 5.0 and 5.8
Hi, Use a name brand 50:1 two-cyle oil. I know it calls for a different mixture, but the lead content/octane has changed in the interim. Peace, crigby
Since the gasoline we purchase these days leaves a lot to be desired, I have been recommending high octane fuel to my customers. Also, avoid fuel containing ethanol for use in your outboard.
15L an hour?
A Vintage Johnson 857171 outboard motor is from the year 1975. These small motors were designed for fresh water use on boats between 10 and 15 feet in length.
I've run every outboard I've ever had at 50:1. Be sure to use oil rated for marine use. www.westmarine.com
305 Small Block Chevy engines typically were 8.6 compression ratio and would use 87 octane fuel.
champin L76V
Johnson outboards use the model number to determine the year model of their engines.