Looks like the 41mm bit is based on the stanchion diameter so bear this in mind when assuming that WR200 USD forks will fit, they wont as the slider part on these is considerably larger than 41mm and wont fit in your yokes. Also FZR and YZF forks will be a lot shorter than DT ones
I considered the hyperpro progressive springs for mine, but they were listed for the R not the X that I've got. Glad I didn't buy them because mine already had progressive springs in!
I went with 15w oil and it's much better now
I think his shock was in a bad state, perhaps its lost some of the oil or gas, thus lacking much of the damping. Or it could just be old and worn out. A new stock one would probably be a big upgrade. Setting the sag should tell if the shock is bad or not.
Cough **** Approx £80 per stanchion including VAT. Upper bushes approx £10 each including VAT. By the time all seals and oil are replaced we will be at something like £250. If it was a Honda we'd have just replaced the bushes and have been at £120 all in. Obviously no labour in that as we're doing it ourselves.