The first five kits I bought all came with the cns2, two of the bushings were a yellowish color. These two bushings fell apart in a couple of months. I made a copper bushing that has worked for the last three years. A lot of people don't like the CNS line of carbs but they run pretty good if tuned right. The best and safest is the choke enrichment lever on the handle bars. Its much better than trying to lower the choke lever on the nt while riding.