Hi to everybody, I just want to share my experience with you. I swap the stock forks with YZ front. I using Yz 450 2006 forks, (46mm top, 49mm bottom) triple clamp was from was from WR 450 2005. The size was 44mm / 48mm and I machined it 1mm top and 0.5mm bottom to be able to put the forks in. I using the original Yamaha steering stem. Bolt it without problem, only on the top clamp i have to put 1mm spacer between the stem and the clamp(the original stem was top 25mm, the new is top 23mm. The front wheel is from YZ 450.I also changed the handle bars with 28mm. What is left is a brake caliper(YZ 450) oversize brake disk 270mm, brake hose line YZ and I am done. I did today a test drive(without front brake, just to see how it is - what a difference, now the front is not diving as before. I need to change the rear shock because now is so soft(compare to the front) and lift it with new bones (35 mm) The YZ front forks are 40 mm longer than the stock. I should be ok with the new bones on rear. A proper test drive I will make next week when everything is done.
p.s I don't know how to upload pictures, if somebody tell me how to do it, or give an e-mail to send it, no problem to do it.