Details of the gas distribution mechanism: 1 - crankshaft; 2 - chain; 3 - camshaft sprocket; 4 - chain tensioner shoe; 5 - chain tensioner; 6 - camshaft; 7 - axis of rocker arms; 8 - rocker; 9 - bearing axis of the rocker arms; 10 - expanding spring of rocker arms; 11 - support washer and valve spring plate; 12 - valve spring; 13 - crackers; 14 - oil cap; 15 - exhaust valve; 16 - inlet valve; 17 - camshaft drive cover; 18 - front crankshaft oil seal.