Hi mate. The clicking noise is the valve on the left hand side by the water bottle. It's called the 'N80 purge/EVAP valve' on these engines. It ventilates the vapors from the fuel tank into the inlet, rather than into the atmosphere as it would of done years ago. It's normal for it to click like that when it is working,(it seems to activate at random times, but especially at start up) but if it is clicking constantly then you can change it.
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