What sounds are made when new top end is needed?

I have a PW 50 my son rides and lately has been acting strange. Will start cold on first kick. When warm, u have to WOT to get it to start. Funny sound comming from head/cylinder area.

Does this sounds like it needs a new top end?

Thanks in advance for the help!

when the rings wear you will hear a ticking or piston tap. its about time to change your top end.

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