Plainsman, no. The cogs only click or clack or whatever you want to call it when you are in 4x4 and going over rough terrain. If it is doing it on the garage floor under no power, Nyroc's suggestions are the more logical answer. Swingarm bearings or even a ball joint or wheel bearing. You gotta start doing some detective work now to figure it out.

The Rock, do you ride with any other 650 riders? Have a listen to theirs if you do and compare. It might be nothing.

 

my 04 700p is the same in low 4wheel drive.
i asked the dealer and he said its normal for them to do that.
it sounds like drivetrain slop.
im told its normal.
im not to worryed about it i still have 2 years warrenty left on it.