1972 Johnson 4HP Outboard Motor Service Repair Manual P/N JM-7202, Page 12Get this manual
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TROUBLE CHECK CHART (CONT) TROUBLE 2LOSS OF POWER(Assuming Ignition OK) (Cont)
POSSIBLE CAUSE BCARBURETORSee Section Poor fuel mixtoo much lubricant Carburetor adjustment(too leanbackfires) (too