The only special tool you need to inspect them is feeler gauges.
If adjusting the exhaust you'll only need a 9mm wrench and square drive driver. Motion pro makes a set that includes these two.
Motion Pro - High quality cables, tools and controls for motorcycles, ATVs, snowmobiles and personal watercraft.
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If adjusting the intake need you'll a couple more tools to get the camshaft out.
To inspect you'll need:
24mm socket (flywheel hole cap)
17mm socket (flywheel bolt to turn engine over)
6mm Allen socket (timing hole cap)
10mm socket (seat and valve cover removal)
Phillips head screwdriver (airbox removal, trust me its easier that way)
Clip removal tool (flat blade screwdriver works, various plastic removal)
A couple extensions helps as well and a light.