Replacing the inlet and exhaust valves, Valve springs, stem seals and collets is simply common sense when overhauling the cylinder-head - interfacing worn parts with new is a recipe for potential disaster - the same maxim applies to the Valve drive train - new tensioner and guide at the very least?
You might wish to add this component and possibly some of those listed below to the same shopping cart, taking care to order the correct quantities required:
Add as many components as you wish to the same shopping cart, new spring seats 3GM1212600 stem seals 33M12119004SV1211900 and Valve retaining cotters 1AA12118001WG1211800 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.