1973 Evinrude Norseman 40 HP Service Repair Manual P/N 4907, Page 12Get this manual
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TRO LE TRO ULE
2LOSS OF POWER(Assurning Ignition )
POWER HEADSee Section Carburetor l11agneto not synchronized Throttle control leve bent (won't advance) Air leak at l11anifo