A two-stroke engine with a compressed-air- assisted fuel-injection system

A two-stroke internal combustion engine (1), comprising a carburettor which supplies a base, a transfer conduit which opens into a cylinder through an air/fuel inlet port (24), and a fuel storage system which communicates with a first port (15) located above an aspirating port (9), and with a second port (14) located below the aspirating port (9), the first port and the second port (15, 14) being alternatingly opened by the piston skirt (3); in the engine the piston skirt (3) comprises a through-hole (31) having a diameter comprised between 0.5 and 3.0 mm, the through-hole (31) being located, when the piston is mounted on the engine, in a same radial plane as the second port (14).