1973 Kawasaki Z1 900 & Z2 750 Factory Production History
The Birth of the 1973 Kawasaki Z1 900 and Z2 750 with Rare Factory Photos & Documentation
During one of the final inspections at the factory, the motorcycle is placed on a calibrated speedometer test stand. The rear wheel is secured while the front wheel is driven by a rotating drum, simulating road speed. Technicians compare the speedometer against the electronic display to ensure accuracy of the speedometer & odometer before the bike leaves the assembly line. This is one of the final steps in the Z1 900 and Z2 750 production process that ensured every bike met Kawasaki’s legendary quality standards.
For the liars out there claiming they’ve got a “Kawasaki Z1 900 with 0 miles”… show them this photo.
Kawasaki always tested every bike before it left the factory, and the odometer was never set back to zero. No Z1s rolled out of the original shipping crate with 0 miles on the clock. They did not leave the factory with zero miles… so that speedometers either been replaced, reset, or reborn.
If you find a “completely all original” Z-1 or Z-2 for sale with just a couple miles, I’m sure those sellers also have some prime oceanfront property in Arizona to show you.
For the liars out there claiming they’ve got a “Kawasaki Z1 900 with 0 miles”… show them this photo.
Kawasaki always tested every bike before it left the factory, and the odometer was never set back to zero. No Z1s rolled out of the original shipping crate with 0 miles on the clock. They did not leave the factory with zero miles… so that speedometers either been replaced, reset, or reborn.
If you find a “completely all original” Z-1 or Z-2 for sale with just a couple miles, I’m sure those sellers also have some prime oceanfront property in Arizona to show you.
A brand-new Kawasaki Z1 900 with 0 miles doesn’t exist; every bike was tested before it left the factory
After leaving the assembly line, the 1973 Kawasaki Z1 900 and Z2 750 were placed on a conveyor belt for another factory inspection. An inspector installs a temporary battery, adds fuel and oil, starts the engine and checks the motorcycle’s operation. Adjustments were made to the idle, clutch, brakes, and throttle to ensure each bike meets Kawasaki’s strict inspection standards before moving to shipping ensuring every Z-1 motorcycle left the factory ready for the road.
Inspectors would perform adjustments on the 1973 Kawasaki Z1 900 and Z2 on the factory conveyor belt.
The final stage of Kawasaki’s triple inspection puts the motorcycle through a complete performance check in a specialized test booth. The bike is run while technicians verify that it produces the specified horsepower, with data displayed to show power output at various RPMs and speeds. During this process, all lights, indicators, and blinkers are also tested to ensure proper operation. The triple inspection was just as it sounds, inspected three times.
Final factory performance test of the 1973 Kawasaki Z1 900 and Z2, part of the triple inspection
After welding, the frames of the Kawasaki Z1 900 and Z2 are carefully inspected for any distortions that may have occurred during the manufacturing process. Skilled technicians make precise adjustments by hand, ensuring that any deviations stay within 0.3 mm. This meticulous inspection guarantees that each frame meets Kawasaki’s exacting standards for alignment, before assembly continues. No frame was stamped with a frame number until reaching the assembly line, this occurred after welding inspection, painting, and a final inspection before any frame would be given a serial number stamp.
Technicians inspecting and adjusting welded frames of the 1973 Kawasaki Z1 900 and Z2 750 for precision alignment
A short video clip of the Kawasaki 900's world debut at the 1972 Cologne Motor Show in Germany
The assembly line at the Akashi Plant Japan 1973
Kawasaki had 35,000 employees in 1973.
This was far from a mom-and-pop small time operation, this was full scale industrial mass production.
Kawasaki had 35,000 employees in 1973.
This was far from a mom-and-pop small time operation, this was full scale industrial mass production.
1973 engine assembly line at the Akashi Plant Japan. Workers completed one engine every 2 and half minutes!
1973 engines in the engine test area at the Akashi Plant
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Original Photos of the assembly line at the Akashi Plant in Japan 1973
This Photo taken in 1973 shows the machine stamping the engine numbers in the upper crankcase, Z1E#####
This is why the matching frame & engine numbering system was abandoned. As the photo shows engines were stamped in sequential batches before being assembled. The engines would need to be assembled and tested before moving to the assembly line to be installed in the awaiting frames. Engine numbers could be higher or lower and with in 250 from the frame number. If you see for example a frame and engine with 1000 or grater difference, that would never be possible and would immediately indicate the frame and engine are combined from 2 different Z1's.
This is why the matching frame & engine numbering system was abandoned. As the photo shows engines were stamped in sequential batches before being assembled. The engines would need to be assembled and tested before moving to the assembly line to be installed in the awaiting frames. Engine numbers could be higher or lower and with in 250 from the frame number. If you see for example a frame and engine with 1000 or grater difference, that would never be possible and would immediately indicate the frame and engine are combined from 2 different Z1's.
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Finished Z1's getting ready for shipment to Europe.
Notice the Z1's are European versions (no reflector on shocks, plastic master cylinder reservoir, seats have a strap)
Notice the Z1's are European versions (no reflector on shocks, plastic master cylinder reservoir, seats have a strap)
Original Photo taken in 1971 of Early Prototype Z1
Photo from 1976 showing a KZ900 being crated in the shipping box at the Lincoln, Nebraska Assembly Plant. Note the KZ900 US made models were shipped fully assembled.
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