Cool bike man. I have the same model. I believe you actually have a 1978 KZ650 B2. luminous blue with that stripe pattern was only offered in 78'.
If i could make a couple friendly suggestions; If you're learning to ride on this bike you might want to put those case savers back on, they already would have saved you some money, just paint em black and you'll hardly notice em. I know you want to change the aesthetics of the bike (turn signals look good btw!), but you may want to get the bike in proper running condition before you spend time and money on customizing it only to learn that it needs something crucial down the road. I would preform a complete tune-up including a valve clearance check, and compression check. I made a this mistake with my first bike, all frosting and no cake, but it looked real good parked ;D. Get yourself a factory service manual and hit up KZrider.com for tech questions, it is one of the best technical forums I have come across.
These bikes are fairly simple to work on, and IMHO preforming your own bike maintenance is part of owning a vintage motorcycle. For example, the mechanic you paid to rebuild your carbs assembled the float bowl covers in the wrong order. The drain screw should be on the outside of carb 4, not the inside. it wont make a difference in how the bike preforms but to me it shows someone rushing a job to get paid. I had a mechanic rush a tire change on me once, only to realize 500 miles later he never tightened the axle bolt. Its good to see someone interested in KZ's in the sea of Hondas that is on this forum. Good luck, ill be watching this one 8)
ps. heres a pic of my B2 right before I had it painted.
