Chrysler 70, 75 and 85 HP Outboard Motors Service Manual OB 3438, Page 123Get this manual
ACOMBUSTION Spark plug ignites the compressed mixtureResulting explosion forces the piston down which in turn rotates the crankshaft BEXHAUST Exhaust escapes through port and combustion chamber pressure fallsFresh supply of fuel is compressed in crankcase
CINTAKE Inlet port is uncovered, fuel mixture enters combustion chamberFlow pattern of fresh fuel mixture helps push out exhaustFigure 1Operation of the 2-Cycle Motor