Re: any harm in back flushing ’67 Johnson 100 hp?

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September 29, 2015 at 7:31 am #24854
Don
Participant

    US Member

    Yeah buddy, these old engines really drink the fuel, your results seem normal for that vintage/style of engine with the big ol 4bbl carb. I know that the recommended fuel/oil mix for that engine is 50:1, but I would double it and use 24:1. In other words, use 1 quart of TCW3 outboard oil to 6 gallons of gas.