1979 6 HP Johnson Outboard Repair and Service Repair Manual PN JM-7904, Page 9Get this manual
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SPECIFICATIONS Model NumbersStandard 15" (381 mm) transom 6RL79 Long 20(508 mm) transom hp (4.2 kW) at 4500 rpm
4500 rpm Part Number 379673 550 rpm in gear cylinder, stroke cycle, ltt fir