Today, while cleaning the raptor, I found that the sprocket has about 1/16th in. of play in it. I also noticed that if you get the rear tires off the ground so they spin freely you can hold the tires and feel a slight wiggle. not much, but just a hair. Checked the axel nut, and it was as tight as I could get it. Any ideas what it could be?

 

Roller and ball bearings have a "hair" of play in them unless they are precision class "6" or higher...which I doubt anyone uses in atv's. Tapered roller bearings like in automotive use can be pulled to a "no play" condition, but that increases friction in them a lot,besides being a nill point on atvs. ( taper roller bearings already have the highest friction in the world of bearings.)

 

Rich888,
When you say, "I got it as tight as I could", it concerns me a little. The Raptor shop manual calls for 85 fp torque, which would seem to be difficult to guage offhand.Since allowing the hub to become loose can damage the hub and strip the splines I'd really suggest that you get a torque wrench in order to get the right degree of torque on this nut as well as others on your ride. The hub nuts need to be checked often depending on how hard you ride.
One other thing; when you wiggled the wheel, did you do it from side to side grasping it at 9 o'clock & 3 o'clock or at 12 'clock & 6 o'clock? The former is probably a hub is loose, but the latter could be worn axle bearings. Try the 12 o';clock & 6 o'clock hold and notice whether there is any movement in the axle itself. If so, you need to replace the bearings as soon as possible.