Occasionally my TTR would make a clunk when you switched it off perhaps once in twenty times. Just recently this seems to be getting more frequent so much so that I have just come home from a Dales ride a day early as I didnt want to do any damage to the engine having just rebuilt the top end. I guess now it clunks (not quite a bang but you cant ignore it!) 2 or 3 times out of 5 when you switch it off. I am a worrier but it doesn't sound right! Advice please