Im looking at buying my first XR1i, seen one at a local dealer and it looks like a minter except there a knocking sound from the engine. Its very slight if im honest and only noticed it when the stealer told me "dont worry about the knocking, its only because the engine has been stood here a while, it will soon stop once its been on the road a while"

Im pretty sure he's talking crap, but can anyone enlighten me on what the sound could be?