My 06 Wee has started a light clicking that sounds like it is coming from the area of the front cylinder. Only when it is moving (I think) I first became aware of it when it was raining. I thought it was just water on the exhaust/cat, but now it is doing it more frequently, and regularly. It is still intermittent, but only when warm. However, it is getting more frequent, and I am starting to wonder if it is a valve thing. At first I dismissed this because it is such a light click (I do know what a ticking valve sounds like), but its increasing frequency has me wanting to know what it actually is. My best description of the sound would be like a small drop of water instantly evaporating like a small click on a hot cat. Anybody have any ideas?