If you are removing the cylinder-head for a piston/valves camshaft inspection, and possibly replacements of some or all of those parts, then why not check the cylinder-head and cylinder out at the same time, the bare minimum should be new valve guides, spark plug and main tightening bolts as the old ones will have stretched threads and be difficult to torque down correctly, and of course a new head gasket - perhaps some or all of the parts listed below maybe required:
Add as many components as you wish to the same shopping cart, new Bolt9502706010 dowel pins 9180816023 and gasket 9020106X09 for example, and still only pay the same single fixed price shipping cost.
Pro-workshop gasket sealant 08C70K0234M to complete the job like a professional.
This component may have other applications within the Yamaha model range.