Engine tappet noise

I bought a Hunter 350 last month which I ridden only 560 km. Recently I have been noticing that when I ride the bike for like 20-30 km basically when the bike gets hot the tappet sound is high. It’s only noticeable during acceleration like when I’m accelerating the bike the noise increases but in idle there is no sound also when the engine is cold even while riding in morning or the first 9-10 km there is no tappet noise. Is it normal or ai just overthinking this….