1978 Johnson Service Manual 6 HP Outboard Motor Service Repair Manual P/N JM-7804, Page 9Get this manual

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SPECIFICATIONS Model NumbersStandard 15" (381transom 6RL78 Long 20" (508transom hp at 4500 rpm
40005000 rpm 4500 rpm Part Number 379673 550 rpm in gear cylinder, cycle, alternate firing 1-1516"

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