2008 Polaris ATV Outlaw 450/525 Service Manual, Page 214Get this manual
5-12 Cylinder head
Loosen the bolts and dismount the exhaust flange together with its gasket
Dismount the valves with the aid of the following special tools: PA-46502Valve Spring Compressor PA-48700Adaptor, Valve Spring Compressor NOTE: When being mounted again, used valves must be mounted in the same valve guide as beforeTo do this, place the valves in cardboard box in the same position they were mounted in the cylinder head (see photo)