The crank link I got was a double, and the chain had less than a hundred miles on it when I added the crank link. The setup the bike came with just did not work with an even number of links, hence the crank link.
The problem when using chains without a cranked link where the drive was designed with one is that it becomes very difficult if nigh on impossible to get the tension right between the gearbox and the rear drive.
This is more of a problem in USA and OZ as the vast majority of chain is Jap and cranked links are just not available.
Ask around for 10B-1 (most rears) and 08B-1 (most primary) and crank links then become available....OK you will more than likely get sold crap but it will fit.
I have recently sold several chains to NZ where a few lads got together to reduce carriage costs, in fact one said that even with the shipping the chain was cheaper and better than he could source.
In USA just ask Bill at GT Engines about me and my product.