For someone interested, I have done the tubeless conversion on my CRF250M (converted to Motard from 250L). It will probably not work off-road if one is riding with low air pressure. There are many methods to convert spoke rims to tubeless, but I believe that the way I have chosen is the simplest and best. I just used goop. It takes two days to complete the process. First applying goop around spoke nipples slowly so it settles, and then moving to the next nipples, and let the goop cure for one day. And the next day, repeating the process and waiting one more day. Now I have zero air leak in my tires. Tubeless tires are safer in case of puncture and you lose all the weight on the inner tubes, plus tubes generate some heat inside the tires.
