This is the tool that I bought:

http://www.bikebandit.com/partsbandit/product~pf_id~5087627~dept_id~2118506.asp

Nothing special about the brand or the source, this, and other brand equivalents, should be commercially available through half a dozen motorcycle websites, just my personal preference to use bikebandit, because they are the shizzle. This tool will brake an installed chain, press a new master link side plate on, and "rivet" a rivet-type master link. I'm not at all aware of what a dealer would use on chains, they may have some high-tech gizmo, but I've never dealt with a dealer with regards to the chain and sprockets, but the tool listed above is easy to use, and gets the job done.

Michael D. Rodriguez