Faint "clunk" or "thump" During ride (New busa owner) Also lowered question.

[xXEvil_RaptorXx]

I just recently acquired a new 2009 Hayabusa, it runs great feels great but noticed just the other day at a constant speed I feel a faint clunk or thumping coming from the left/rear of the bike. kinda feels like a ball the tire but the source isnt coming from the tires. This only happens when I keep a constant speed gone at accel or decel.
Anyone have any suggestions? Other than this it feels great!
Also I am planing on replacing the rear shock. currently the bike is lowered and feels stiff as hell I need this thing to have a more plush ride, and factory ride height.
Could whatever they used to lower it be connected to the first problem? Thanks for yalls input

 

[mjl3truck]

Yes on the lowering thing maybe but I would look at chain and sprockets first.

 

[ve3nsv]

My old 750 Katana did that when the chain went bad.

 

[xXEvil_RaptorXx]

I will look into all this thanks!