Hello all - I'm the new boy, so it's my round at the bar. Been a member of Bikenet and Visrdown.com for quite some time, happened across this site via a link on http://www.dirtbikestore.co.uk/. I've had a couple of YZ250's (I have a really nice 95 YZ250 for sale BTW), but I have just bought a 99 YZ400. I've ordered a Clymer manual but know nothing about these motors. The oil in the frame appears to be way over the max level, and when the motor in running you can hear a noise - doesn't sound like cam chain or small ends - do these motors make much mechanical noise? Can't say I've noticed much from others at Chippenham or Mildenhall? I'm all ears.