| 1 | In its initial stage the change-of the camshaft is performed. | |
| 2 | Therefore, the camshaft must revolve at exactly half the speed of the crankshaft. | |
| 3 | The eccentric may be part of the camshaft itself or may bolt to it. | |
| 4 | Remove the camshaft retaining bolt and remove the sprockets and chain as an assembly . | |
| 5 | In the engine, cams on the cam shaft cause the intake and exhaust valves to open. |