Most likely needle bearings are shot.
I am recommending moly paste for lubrication these days.
Post pics and PM me for any parts you need for free.
I have seen a few shafts over heat treated and have brittle flaking failure that can damage the needle bearings.
Since you ride 2 up loaded a lot and mostly off road that is the toughest loading on the shock mounts.
2013 Ducati Hypermotard SP, 2011 Husaberg FE570S, 2011 BMW S1000RR, 2010 BMW F800GS
2007 Husqvarna TE610 , 2003 KTM 525 MXC
Indy Unlimited screwed with this post 01-12-2013 at 07:21 AM