The Zephyr 400 was only available in a very limited number of markets, so you may find it hard to get info from most of the world. That said, all the carb specs should be in the service manual. Once you have the specs to post here, I can probably help you find carbs that will work.
| 1990 Kawasaki Zephyr 615 (Daphne) -=- 1986 Kawa Ninja 250 (stolen) |
| The Motorcycle Fuel Injection Handbook -=-
http://tinyurl.com/297abo |