FIELD: mechanical engineering; engines. SUBSTANCE: two-stroke internal combustion engine has air cleaner 1, air blower sleeve 2, air blower piston 3, plate members 4 secured on piston 3, air spaces 5 and 6, combustion chamber air space 7, rod 8 of stepped piston 9 and air space 10. It has also valve box 11 with plate members 12 and crank chamber air space 13. Exhaust manifold is made in form of space 14, slots 15 in sleeve 16 and combustion chamber air space 7. Valve box 11 is secured on crankcase 17 which accommodates crank 18 connected by connecting rod 19 with stepped piston 9 reciprocating in cylinder 20. Fitted in cylinder 20 are sleeve 16, air blower sleeve 2, seal 21 of rod 8 of stepped piston 9 and spark plug 22. EFFECT: enlarged operating capabilities. 5 dwg
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