1975 Johnson 4HP 4R75, 4W75 Outboards Service Repair Manual P/N JM-7503, Page 13Get this manual
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TROUBLE CHECK CHART (CONT) TROUBLE POSSIBLE CAUSE BC:.RBURETORSee Section Poor fuel mixtoo much lubricant Carburetor adjustments(too eanbackfires) (too richexc essive fuel) Choke not operating properl