FIXED: Rear axle click clunk noise

Originally Posted by juld0zer

the spring washer is the big washer that goes beneath the big axle nut. you need two per side because the Kawasaki nut is *shorter* than the OEM axle nut.

the Kawasaki nut is actually physically almost identical in size but since it is the castellated type (nut with inbuilt castle-like top), the castellated slots fall short of the cotter pin hole in the axle.
For this to be an effective fix, the slots must have a cotter pin driven thru them, hence the need for an extra washer.