Headlights were Made By Stanley, they are sealed beam units. Stanley also made the headlight bucket and mounting ring.
Spark Plugs were NGK
Pistons were made by ART Metal Mfg. Z1 Pistons are 66mm.
Marked ART on the side and ink stamped on the top either 1A, 1B, 2A, 2B. Oversized Pistons are marked on top.
Marked ART on the side and ink stamped on the top either 1A, 1B, 2A, 2B. Oversized Pistons are marked on top.
Original Front tire was a Dunlop Gold Seal 19" F6 B
1973 Z1 900 Super 4
Frame Number Range: Z1F-00001 to Z1F-20000
Engine Number Range: Z1E 00001 to Z1E 20000
Frame Number Range: Z1F-00001 to Z1F-20000
Engine Number Range: Z1E 00001 to Z1E 20000
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The Z1 was produced from August 1972 to July 1973
Z1's made in August 1972 can have matching frame and engine numbers
All other Z1's have a Frame Number that is within approximately 250 of the Engine Number
Engine & frame production followed a sequential numbering system. Z1F for Frame, Z1E for Engine, 00001 to 20000
Z1's made in August 1972 can have matching frame and engine numbers
All other Z1's have a Frame Number that is within approximately 250 of the Engine Number
Engine & frame production followed a sequential numbering system. Z1F for Frame, Z1E for Engine, 00001 to 20000
Z1 Engine Numbers are stamped on a 65mm by 14mm (2.5"x0.5") rectangular block on right side of engine.
Engines were painted black with polished aluminum fins and covers.
Engines were painted black with polished aluminum fins and covers.
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The frame number is stamped on the left side of headstock
Frames were painted then stamped, frame numbers are stamped to bare metal not painted over.
This frame number is also printed on the white identification sticker.
This manufacturers conformity tag was required for US imports beginning the 1970 model year.
It has info including the date of manufacture in Month/Year format
This date reflects when it was made, not when it was exported, imported or sold.
The original sticker might show wear, but it will never come off unless intentionally removed.
Frames were painted then stamped, frame numbers are stamped to bare metal not painted over.
This frame number is also printed on the white identification sticker.
This manufacturers conformity tag was required for US imports beginning the 1970 model year.
It has info including the date of manufacture in Month/Year format
This date reflects when it was made, not when it was exported, imported or sold.
The original sticker might show wear, but it will never come off unless intentionally removed.
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The Z1 colors: Orange on Brown or Yellow on Green (only available in Europe).
Official color names: Candytone Brown or Candytone Green. Kawasaki made no mention of Orange or Yellow.
USA & Canada only received Orange on Brown, Europe had both color options.
The Z1 was made in Japan but it was never sold at dealerships in Japan. It was exclusively made for export.
Kawasaki's target market for the Z1 was the USA, receiving the vast majority of all Z1s produced.
Official color names: Candytone Brown or Candytone Green. Kawasaki made no mention of Orange or Yellow.
USA & Canada only received Orange on Brown, Europe had both color options.
The Z1 was made in Japan but it was never sold at dealerships in Japan. It was exclusively made for export.
Kawasaki's target market for the Z1 was the USA, receiving the vast majority of all Z1s produced.
The Z1 Speedometer & Tach have a wide space between mph & ND / x1000rpm & ND
ND is Nippon Denso the company that made them
(The Z1A will have a close gap between mph ND / x1000rpm ND)
ND is Nippon Denso the company that made them
(The Z1A will have a close gap between mph ND / x1000rpm ND)
Lights order NEUT FLASH BEAM OIL
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The tachometer font of the 7 changed in production of the Z1. Straight 7 was used first, later a curved 7.
The Position of the speedometer marker at the 20 mph also changed in Z1 production
The Position of the speedometer marker at the 20 mph also changed in Z1 production
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Carburetors were Mikuni VM28SC. Carbs are marked 1470 or 147 with 2 or 3 under the 147
Choke Lever has a black cap. The ON and arrow highlighted in red paint.
Choke Lever has a black cap. The ON and arrow highlighted in red paint.
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Z1 uses 155mm long Kawasaki Tank Badges (122mm between the screws)
Rear brake lining has NO wear indicator. All Z1A & Z1B has a wear indicator.
The last few thousand Z1's produced could have the updated casting as old stock ran out.
Those Z1s with the new casting would not have indicator arrow or useable range decal.
The last few thousand Z1's produced could have the updated casting as old stock ran out.
Those Z1s with the new casting would not have indicator arrow or useable range decal.
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No gear change pattern (1-N-2-3-4-5) embossed on the chain case cover near gear shifter.
The last few thousand Z1 produced could have the updated casting as supply of the old cover was exhausted.
The last few thousand Z1 produced could have the updated casting as supply of the old cover was exhausted.
Z1 & Z1A used a chain oiler, Z1B did not. The chain oil tank is under the left side cover.
Z1 used two style labels. Earlier being without the SAE 90.
Z1 used two style labels. Earlier being without the SAE 90.
The plastic drain cap on the bottom of the tank changed from white to black. White being first used.
Reservoir cap has "BRAKE FLUID" cast in metal
Z1 Tail section document tray has 3 versions, the first label used has NOTE & engine oil capacity 3.7 qt.
This was changed December 1972, removing the word note and changing oil capacity to 4.2 qt.
This updated label still had square corners, with the final version changing to rounded corners.
This was changed December 1972, removing the word note and changing oil capacity to 4.2 qt.
This updated label still had square corners, with the final version changing to rounded corners.
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The Z1 Frame Does NOT have a hole in the frame brace sheetmetal.
If a hole is there, the frame is a Z1A, Z1B or a replacement frame.
If a hole is there, the frame is a Z1A, Z1B or a replacement frame.
The engine case has some subtle differences in the casting. For example the lower corner of the engine case.
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Just because the engine's painted black doesn't mean it's a first model Z1
The cylinder head has a few variations, the most obvious is the 903cc marking.
Z1 cylinder heads have the 903cc cast on a raised block, the Z1A Z1B and kz900 do not.
There are two versions, one having a gap between "903 and cc"
Z1 cylinder heads have the 903cc cast on a raised block, the Z1A Z1B and kz900 do not.
There are two versions, one having a gap between "903 and cc"
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Z1 Exhausts were welded together (muffler to header) then chromed
Z1A/Z1B were chromed then welded together, you will see a large band at the muffler connection covering the weld
Z1A/Z1B were chromed then welded together, you will see a large band at the muffler connection covering the weld
There were 2 versions of cast aluminum Lower Front Fork legs.
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Headlight fork ear brackets have a smoothed seam, the Z1A & Z1B have visible seams
The font brake caliper mounting bolts have 3 variations.
Earliest has a small hex star inside the mounting bolt. Then came a larger star, finally no star.
Earliest has a small hex star inside the mounting bolt. Then came a larger star, finally no star.
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Z1 had 2 brake splitter variations.
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2 Variations of the Engine Oil label were used.
The 1st label has 3.7 quarts (3.5 litres) & 'MS'
This was revised November 1972 to 4.2 quarts (4.0 litres) and 'MS' was removed
The 1st label has 3.7 quarts (3.5 litres) & 'MS'
This was revised November 1972 to 4.2 quarts (4.0 litres) and 'MS' was removed
Only 1 label was used for chain warranty on the Z1. Label was changed late Z1A adding 3,000 miles printed on the label.
The Petcock has 2 variations.
1st version has aluminum outlets for the fuel lines, 2nd version was brass.
The lever was also modified to add a o-ring to stop potential leakage.
1st version has aluminum outlets for the fuel lines, 2nd version was brass.
The lever was also modified to add a o-ring to stop potential leakage.
Only the Z1 has a throttle friction screw
4 versions of the owners manual exist, with slight variations.
August 1972, November 1972, March 1973 and June 1973
The first edition manual printed August 1972, has a 3D font for "Z1" and owner's manual is printed in smaller lettering.
Other countries had manuals printed in their language such as Italian, French & German
August 1972, November 1972, March 1973 and June 1973
The first edition manual printed August 1972, has a 3D font for "Z1" and owner's manual is printed in smaller lettering.
Other countries had manuals printed in their language such as Italian, French & German
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Some March and all June 1973 printings are slightly smaller in size.
Very early 1974 Z1A models were given the June 1973 Z1 owners manual.
Part number 99997-800
Very early 1974 Z1A models were given the June 1973 Z1 owners manual.
Part number 99997-800
Z1's have 32" wide handlebars with a 5" rise and 7" pullback.
On the right side of the frame, there is a welded bracket to add an adjustable steering damper.
The frame has pre-made holes for adding an optional engine oil cooler. Riders who lived in hotter climates or areas with heavy city traffic could opt for this add-on to prevent overheating of the air cooled engine.
Rims have 40 spokes.
The original 12 volt battery was a Yuasa 12N
Original tires were Dunlop Gold Seal, Front 19" F6 B / Rear 18" K87 MARK II M
On the right side of the frame, there is a welded bracket to add an adjustable steering damper.
The frame has pre-made holes for adding an optional engine oil cooler. Riders who lived in hotter climates or areas with heavy city traffic could opt for this add-on to prevent overheating of the air cooled engine.
Rims have 40 spokes.
The original 12 volt battery was a Yuasa 12N
Original tires were Dunlop Gold Seal, Front 19" F6 B / Rear 18" K87 MARK II M
The Z1 was sold worldwide, but some countries were excluded. Surprisingly one of those countries was Japan.
Various countries had different regulations for motorcycle manufactures to comply with.
Slight variations exist from country to country since Kawasaki had to conform to specific regulations.
European models featured a seat strap for a passenger, Long rear fender, km/h speedo, fixed foot pegs, reflectors were not required and not used. Frames for Germany and Sweden have steering locks welded on the left side of the headstock. Australia and Germany used a Metal riveted tag on the frame instead of the white sticker used for US models.
Some countries such as Italy has a (*) added to the frame number.
The factory produced 4,846 Z1's August 1972 to the end of December 1972.
January 1973 thru July 1973 produced the remaining 15,000 Z1's.
The 1974 Z1A was also made in July of 1973, which can cause people to mistakenly believe they have a 1973 Z1.
Some people will falsely assume they have a 1973 Z1 because the identification tag shows a 1973 production date.
If the frame or engine number is above 20,000, (higher then Z1F-20000) its not a 1973 Z1.
In fact, Kawasaki made more 1974 Z1A models in 1973 than they made 1973 Z1 models!
Z1 Specs: 903cc Engine, 82hp. Top speed over 125mph. 1/4 mile: 12 seconds.
Weight: 506 pounds (no oil or gas)
Various countries had different regulations for motorcycle manufactures to comply with.
Slight variations exist from country to country since Kawasaki had to conform to specific regulations.
European models featured a seat strap for a passenger, Long rear fender, km/h speedo, fixed foot pegs, reflectors were not required and not used. Frames for Germany and Sweden have steering locks welded on the left side of the headstock. Australia and Germany used a Metal riveted tag on the frame instead of the white sticker used for US models.
Some countries such as Italy has a (*) added to the frame number.
The factory produced 4,846 Z1's August 1972 to the end of December 1972.
January 1973 thru July 1973 produced the remaining 15,000 Z1's.
The 1974 Z1A was also made in July of 1973, which can cause people to mistakenly believe they have a 1973 Z1.
Some people will falsely assume they have a 1973 Z1 because the identification tag shows a 1973 production date.
If the frame or engine number is above 20,000, (higher then Z1F-20000) its not a 1973 Z1.
In fact, Kawasaki made more 1974 Z1A models in 1973 than they made 1973 Z1 models!
Z1 Specs: 903cc Engine, 82hp. Top speed over 125mph. 1/4 mile: 12 seconds.
Weight: 506 pounds (no oil or gas)
If you don't see a white sticker on your frame headstock... You probably have a replacement frame.
Replacement frames do not have a white Identification sticker. MADE IN JAPAN is visibly stamped in the frame.
Remove the gas tank, you might find a replacement part number tag on the center frame tube, only found on replacements.
There are a few slight variations of replacement frames that were available.
One version has KHI DMG13235 0M Stamped in the headstock (this is NOT a frame number).
Faint impressions, crooked numbers, variations in font and size, are all clear signs of a replacement frame.
A replacement frame or engine will significantly lower the value of any Z1.
If you have an estate to liquidate or non Kawasaki motorcycles here are websites that might be able to help you. https://www.weekendestatesales.com/ https://www.wantedoldmotorcycles.com/