Not an expert or even close.
If your 2010 came with the PWK ASII it will have a smaller bowl than the older models and a flat metal cap which is held down by 2 screws. On the top of this cap will be a circle with a number printed in it. 36/38.
If its the older style with the screw cap odds are it is a 38mm. Not sure if anyone reported 36mms sneaking through with these. Think it was more a 2011 thing actually.
The KTMs use 36mms so you can get it to work for you. It will flow better at lower velocities. Smaller openings. Will sign off a bit up top. The opposite for a 38mm. Ideally you'd want an oval bore to get the best of both worlds. Thats what I'd be doing if I had a 36mm.
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