egjsc- Welcome to the forum.
Nice bike!
How many miles have you ridden it so far? Any major problems putting it together?
A couple of things...
Did you remove the petcock from your gas tank and throw away the kit provided fuel filter? If not, I recommend that you do so. At the same time, you should flush all the Chinese gunk out of your tank and install an automotive type, clear in-line filter. An in-line lawnmower type fuel shut off is cheap, and recommended as well. You'll need a barb fitting to go into your tank if you do this.
Here's an example for both of my suggestions;
http://motorbicycling.com/showthread.php?t=57089
You can easily remove that kit provided chain tensioner and replace it with- nothing! They are not needed, and it's one more thing that can break. Simply remove it and throw it away. Resize your drive chain, use a half link if you need to, and you won't have to worry about that thing rotating over into your spokes at 15mph!
Good luck!
Trey