I have a 2005 YZ 125 which has been highly modified by the previous owner. It still has the KYB AOSS forks fitted and by chance I found some super cheap 2006 YZ450f KYB SSS forks which need a rebuild. I also bought the rear because it was so cheap, is it worth bothering with the rear? After as much searching as I could do about the swap, there is supposed to be little difference in the rear shock. I will obviously have to buy a new spring to use it, so I'm hoping to keep it as a spare with the intention of rebuilding it eventually with the right spring to put on the 125. I am confident that the forks will bolt right up to my existing Scar clamps, I don't want to change them if possible so I will shave the spacers if necessary. I have read that the axle floats in the pinch bolts, (which it does...) so shaving material from the spacers is actually not necessary even though it says that's needed in the majority of places.
Now, my real question is what will I need to change internally on the 450 forks? I assume the valve stack will be different? I had a look through the stacks which are listed in the sticky, but I wanted to check first what stack is best! I've already worked out I need a .42kg spring for my weight (70kgs) which is a stock 2006 YZ 125 spring... If I do just this, will I need to alter the valving at all??
Thanks for your help!