1975 Evinrude 2HP Model 2502 Full Factory Service Manual, Page 34Get this manual
DESCRIPTION
The power head cons ists of one cylinder, piston, rod, rankshaft, and crankcaseThe cylinder is horizontally mounted in vertical plane and delivers one power im pulse per crankshaft revolutionSee Figure 5-1FUEL INTAKE AND EXHAUST
THEORY OF OPERATION
EXHAUST
EXHAUST GASES