Hi Guys, Im new to the liquid cooled thumpers i just got a yz450f '04 and i would like to ask some questions and i would really apreciate your answers. ok 1- is the motor suppost to be noisy, i mean i can really hear whats goin on in there is that normal? 2- any mods i should do the the 450f? 3- Do these bikes have any problems? 4- i just finished breakin it in, im gonna changet the oil do i have to change the oil filter? thanks in advance guys ! one more thing... do liquid cooled engines make more noise than air cooled engines?