1991 Johnson/Evinrude Models "EI" 40 thru 55 Service Repair Manual P/N 507947, Page 18Get this manual
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Engine Specifications 45 and 55 mmOperation Full Throttle Operating Range Power Power Rated Idle
Displacement
3.1875 in(80,96 2.820 in(71,63
Stroke StandardCrankshaft D