1979 Evinrude Outboard 2 HP Model 2902 Service Repair Manual P/N 5423, Page 35Get this manual

1979 Evinrude Outboard 2 HP Model 2902 Service Repair Manual P/N 5423, Page 35

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DESCRIPTION
THEORY OF OPERATION
COMPRESSION STROKEUP

outboard motors require only two piston effect crankshaft revolution and to complete the exhaustintakecompressionignition