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What is the mix ratio for a Johnson outboard motor?
Any Johnson outboard motor built since 1964 requires a 50/1 fuel ratio. Motors built prior to that date require a 32/1 ratio, with the exception of a few fishing motors built prior to 1955 that use a 16/1 ratio.
Hi Paul:
My old Evinrude called for 32:1 and they were second cousins.
I'd bring spare plugs and a wrench as part of my "kit" if I were running an engine that old.
Better to run extra oil and not break it.
Cheers.
50:1 since the late 60's
Too much oil will gum up the rings, smoke too much and foul plugs. Use ONLY major outboard manufacturers oil, Mercury, Yamaha, Johnson/Evinrude TCW-3. They work the best, and no alcohol fuel.
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