1975 Johnson 4HP 4R75, 4W75 Outboards Service Repair Manual P/N JM-7503, Page 7Get this manual
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SPECIFICATIONS Model 4W75 (Weedless gearcase) 4R75 (Standard gearcase) hp at 4500 rpm Propeller gear ratio Propeller drive Propeller 17:28 (Weedless) 12:25 (Standard) Part Number 316558 18" 1.234" sta