Hi Everyone, Hopin' yall can help with a concern I have with my '03 WR450. The engine has quite a loud knocking sound which seems to come from the upper part of the engine. It's there all the time, ie when hot, cold, idling. If I lean over the handlebars, I can even hear it while riding at low speeds. After making a few local enquiries, I'm told that these engines are quite noisy and this was quite normal. I've checked the valve clearances.......... Examined the cam lobes and followers..... Checked the timing chain and tensioner... Changed the oil using correct spec......... I can't work out for the life of me, where this noise comes from. I'm pulling the barrel off tomorrow to check the piston. To all you WR owners out there, are these engines quite knocky or is it just mine. Other than the noise, the bike's fine. Any help much appreciated, Andy.