rrebel

Hi guys, Iam living in Aruba and own a K12 import from Japan. last couple days i hear a loud banging sound when i drive the K12 on bumpy roads. (we only have bumpy roads here ;) ). I took of the left rear wheel, and it look likes the excaust hits the spring of the shock. is this a known problem? i also took of the shock it self and i can compress it pretty easy by hand is this normal? but even if the shock needs replacement the spring should not hit exhaust right? Thanks, Raymond