Hopefully an easy one for somebody! My 87 did it as well as my 2000. When I first start my XR600 there is a clicking, comming from around the right side clutch case oil filter area. I know how sound resonates through metal. This is not comming from the valves. It does it about every day in the winter when I ride it to work for about 30 seconds to a couple of minutes. Could it be a clogged line somewhere, because it eventually gets oil and shuts up after a little bit. So I wonder if it is getting enough durring operation. Also I used to dump the clutch in 2nd to get a good wheelie going and it grabbed like there was sand paper down there, but now it slips a little. Not a lot but just enough to notice and therefore slips a little in third. When I dump it in third is when I could go a long way in a wheelie. Any coments are welcome. Thanks guys for all your help in the past and for any here.