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