I couldn't find the "master link" in my chain either, all looked the same. I went to the local bike shop and picked up a standard o-ring 520 master link and a chain breaker. Ground off two of the pins on one link and then used the chain breaker to remove it, then used the new master link I got to reconnect. Have heard of others doing this with factory chains on other quads, don't expect any problems.
Doug