i blew the headgasket out on my 1983 xr 500 last week. i ordered the gasket kit and the clymer manual to do the job. i got the gasket last week, but still no book.. i was chomping at the bit to get this thing back rolling so i went ahead and replaced the gasket. the issue i am having is timing. does anyone know the procedure to time the chain and camshaft? i zip tied the chain to the wheel, but it moved. i now it is pretty easy, does anone have any tips.. i wanna go ride. thanks.