Hi iv recently bought a wr426 2002 its done about 5000km i was out riding it 2day and noticed that wen accelerating from low revs there is a strange sort of grinding noise, it sounds like its coming from the gear box, it doesnt make it in mid- high rpm just seems 2 b wen u accelerate from low rpm. i havnt owned a wr b4 and dont know if this is normal? i changed the oil and filter a week ago and there was no sign of any metal. do i need 2 strip down the gearbox and investigate? how easy is it 2 do? i searched the forum but cudnt see any similar articles! Any help would be appreciated! Thank you.