Welcome!
Did you try asking the dealer? Depending on your location, you may be hard pressed to find anyone to do work on an older motorcycle.
If you're up to it, I'd encourage you to purchase a factory service manual and do it yourself - valves can be adjusted without removing the engine. There's an awful lot of value in learning how to maintain your own ride! However, those sounds could be just about anything and depends where it is coming from. Do you notice a loss in power or acceleration?