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The first number is the year and the second number the month, So 3 6 is June 1973. On the back of the chrome bar is a date code.

The code uses the format Y MM where the first number is the year and the other numbers are the 1 or 2-digit month. This shows the date of manufacture for the swing arm. On the top right front of the swing arm, by the grease nipple, is a date code. While this is not always a problem, it will of course tell you if the bike in question is 100% original! Remember though that parts may have been changed under warranty at a later date unknown to the owner or indeed the restorer. Yet on close inspection of numerous 'restored' bikes, it is obvious the restorer utilized factory replacement parts or parts from later models to replace marginal or damaged parts. It is not reasonable for parts to have been made AFTER the build date. For a bike assembled in June of 1973, it is reasonable to expect all of their parts to have been made in the current month (Jun 73), prior month (May 1973) or even two months back (April 1973). On a number of Z1 components are date codes. On 1972/1973 models, the 903 CC legend on the front of the cylinder block is stamped onto a raised block, all models afterwards are stamped directely onto the barrel.

Very early 1972/1973 models do not have the legend "KICKSTART" embossed on the crankcases and 1972/1973/1974 models have a horizontal casting mark on the front crankcases in front of the alternater cover. While the frame and engine numbers are the best indication of the model and whether the engine has been replaced, these are not the only numbers to help validate an 'authentic' Z1. Most bikes have the engine number higher than the frame number, but this is not always true. The engine numbers follow the same general range as the frame numbers although Frame and engine numbers were not matched at the factory. Z1 & Z900 engines have engine numbers stamped on the top right side crankcases on a raised area over the clutch. THE KZ900 LTD FRAME NUMBERS RAN FROM KZ900B-500011 THROUGH 505514 Z1F-500001 through Z1F-510340 for bikes assembled in Lincoln Nebraska

Z1F-85701 through Z1F-138846 for bikes manufactured in Japan The frame numbers will be in the following ranges This date of course can be many months before the bike was actually registered, normally around 2-3 months. Additionally, in the USA & Canadian market, there is a white sticker on the steering head showing the frame number and the date of manufacture.