Check the easy stuff first.
1. oil level AND for contamination
2. check for exhaust leaks
3. clean your cam chain tensioner
4. really, really, really bad gas
Also, does it tick only when when in motion?
Other things that can make noise;
Engine mount bolts, brake pad slides, frozen chain links, valves, steering stems, levers ect... ect..
You also might want to just redo a 600m service on the bike and ensure all bolts are tight.
I hope it something simple, good luck!
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