1979 Evinrude Outboard 55 HP Service Repair Manual Item No. 5428, Page 10Get this manual
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SPECIFICATIONS Model Numbers 55974 (standard length) 55975 (5" (127longer) Horsepower (B.I.Acertified) 55 (38.9 kW) at 5500 rpm Full throttle operating range 5000 to 6000 rpm Idle orifice plug carbure