Hey guys, I have an 02 800 edge x and an 05 xc sp 600. Both of them make the same noise. It happens after I have slowed down and then hit the gas again. It makes a "thunk" sound. I can't quite place the sound, but it sounds as though it is coming from the secondary or the chain case. It is like the clutches are trying to catch up or somthing. I am wondering if this is normal, does anyone else have this? Or should I be worried and try to fix this?