Z1 disguised as CB750

"The first prototype was completed in the spring of 1971. This prototype was ridden by
American test riders with minor adjustments made step by step. In the fall of that year, the final prototype was completed and after testing, the unit was approved for mass production. The first production model was completed in February 1972, and this unit was subjected to repeated severe road testing after which all parts, including even the nuts and bolts, were examined. After reworking all weak points, the first mass-production model was built in May 1972"

 Z1 was designed in the US and tested in the US. When the field tested the bike, they attempted to disguise the bike as CB750. As you see here, other than the badges on the tank and side cover, they did not anything.

1972 Talladega.
Testing 1st Kawasaki Z1 900 in the USA.
May-San fron Japan (one of the engineers from Kawasaki).

Pictures from Koup's cycle shop's photostream