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Have they been revalved? They come valved for a 350/450 and that won't be right for a two stroke.
This says it will be ok for 2 stroke !?

A 125 and 450 are going to have very different settings, I’m not quite sure how they go about that. I use the correct springs and run 0-2mm of preload
Im using the correct springs and the preload from the manual ( btw the 2 stroke preload setting is different to the 4 stroke preload setting )
but I’m surprised nobody is able to say how you check the sag correctly on these forks .

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So you have the "out of the box" cartridges as they come delivered from WP? Not re-valved by a tuner, correct?
When I got mine from JBI, he said back the preload nut all the way out, then go in 1-click. That is your "zero setting". All those settings above are then measured from there. He then had me just 2-clicks (1 turn) in from there. Keep in mind preload is also affected by the preload washers installed internally. I have since gone another 2 clicks in from that and also swapped the forks from my original FC350 to my MC300 2-stroke ! They work excellent on both bikes.
Don't overthink the preload. Pick a setting from above to start and don't be afraid to alter from there to get the front/rear balance and attitude right. It's another nice adjustment to have to use in conjunction with rear preload, rear HSC, and fork height to adjust the chassis.
Yes standard valving . Was just looking for a way to check the sag.
I also ran same carts in fc350 👍
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