Two-stroke internal-combustion engine

A two-stroke internal-combustion engine comprising:

• a cylinder block having a cylinder therein;
• a piston reciprocally movable in said cylinder, said cylinder having an inner wall which has a scavenge port and an exhaust port formed therein and being alternately covered and uncovered by said piston;
• a crankcase having therein an interior chamber, the pressure in said interior chamber being alternately increased and decreased due to the reciprocal motion of said piston;
• an intake passage having an air inlet and being connected to the interior chamber of said crankcase;
• a transfer passage interconnecting the interior chamber of said crankcase and said scavenge port, outside air being fed into said cylinder via an air passage defined by said intake passage, the interior chamber of said crankcase, and said transfer passage;
• fuel supply means arranged in said air passage for feeding fuel into said air passage so as to create an air-fuel mixture therein;
• and
• fuel-separating means arranged in said air passage for separating fuel from said air-fuel mixture so as to create a richer air-fuel mixture and a leaner air-fuel mixture, said scavenge port having such a construction that said rich air-fuel mixture flows into said cylinder towards the inner wall of said cylinder located opposite said scavenge port.