RichG wrote:Have you looked at the chain above the gearbox sprocket area?
There is a minor bracket / brace that should attach to the rear engine mount shaft. But if not attached, it will hang down onto the chain, just above the swingarm pivot, and make a clicking sound as the chain rubs against it. I know from experience And it was only when free-wheeling you can hear it.

This is an important bracket!
It`s the torque arm that stops the rubber mounted engine from twisting under power.
I think Matt said he had a clicking/clunking noise coming from Pauls bike which he traced to this arm having worn bushes. So, even if it is in place. If it has worn bushes it can cause a noise.