I have an 03 Raptor660 and noticed the other day that the rear sprocket has some looseness on the axle splines. I check the brake disk and it was slightly loose as well. Is this normal? The rear end is not loose, I put the bike on a stand and wiggled the rear end. It does not have any slop. Also, what is the size of the axle nuts? Looks like 50mm.

that happened to my bike and it was my lock nuts were loose so it gave the caliper and sprocket play but it wasnt loose enough to move my axle. tightened them havnt had a problem since

does your rearbrake work because mine didnt.

warriorboy22
Rear brake works fine.

Something I forgot to mention. It only does it when the bike has been ridden for a while. Anyone know the torque value for the axle nuts for the Raptor660?

Look in your manual should have the torque ratings listed. Go to the part where it talks about maintence or somthing on the axle etc and should have them listed.