Hello everyone

I have purchased a yamaha tenere 2008,and have a question about front forks.When i drive in sharp bumps i hear a plastic sound coming from the front of the bike.I have a theory that the sounds occur because of the forks slowness.Maybe its to slow to react and a sound appears? its a fork with preload spring,maybe that kind of forks make sounds? i am no expert

so if anyone have any ideas or experience,please answer me

I am swedish,thats why i am bad in writing in english=)