Sharko, you've got a 92/93 KDX. Check out
http://justkdx.dirtrider.net/ - check the timeline.
You won't be able to tell from
www.buykawasaki.com as the VIN thing only works on US bikes.
There will be a number on the frame you can work it out from, but I can only tell you the later H model years, sorry. You could check with a dealer over here, they should be able to tell you.
The noise is probably just a KDX noise. Try adding more oil to the tranny & see if that helps - if so, it's just the KDX trait.