I have been going right through my bike recently (2002 WR426F) to check
everything is all good ready for a bit of track work and all was looking good
until i come to checking and adjusting the valves...
Both 2 exhaust valves were nicely within spec as was the LH intake valve, but the
middle and RH intake valves were extremely tight (couldnt fit the thinnest feeler
guage in 0.036mm)
They currently are running 1.40 shims in both center and RH intakes (tight ones)
and a 1.65mm shim in the LH intake (in spec) valve.
I have put my numbers into a valve shim calculator and it has come back saying I
need a 0.8mm thickness shim to correct the 2 tight valves but looking at valve
shim kits online they state the thinnest they have is a 1.20mm
So my big question is any thoughts on the huge variation between intake valve
readings and would needing such a thin shim to correct the valve clearance
mean the valve seats are too far worn into the head?
Sorry for the long read hoping someone can shed some light on this for me
Thanks in advance !!!