It's a K4!

Okay, after some prodding from Andrew "2Bike" Kesin, it seems my motorcycle is a K4 model. How do I know? The vin (40xxxx) and info on the web. This is actually pretty important info since I am tracking down parts and I want my bike to be as original as possible. I also kind of like looking at this picture and thinking of the day my motorcycle will sparkle like this.