I posted this question over at SuperMotoJunkie.com as well.
My results are posted there, so for the sake of saving myself some typing, here's the link: clicky.
eflyersteve
Subject: Re: Tubeless? Fri Dec 16, 2011 2:15 pm
I've gone tubeless without any issues. I used RTV as a sealant over the spokes and installed a tub less valve stem. The concern with going tubeless on a tube type rim would be if the wheel hoop is designed to retain the bead in the even of a flat. The stock 'X' wheels seem to hold the bead really well although I've not had a tire go down at highway speed yet. I've been running tubeless shortly after getting the bike in the spring.