1972-1975 Kawasaki Z1 Knowledge Library

1972-1975 Kawasaki Z1 Full Specifications

Get to know the 1972-1975 Kawasaki Z1 in exquisite detail with our meticulously crafted motorcycle specifications tables.

Click or tap on a navigation pane below to find your way through our highly detailed, categorised 1972-1975 Kawasaki Z1 specifications.

Performance Specifications Table

Attribute	Value
Standing start 1/4 mile	12.0 seconds
Climbing ability	30 ^o
Fuel consumption	40 mpg (average)
Braking distance	10.9728 m @ 31 mph
Minimum turing radius	2,500 mm

Dimensions Specifications Table

Attribute	Value
Overall length	2,250 mm
Overall width	820 mm
Overall height	1,175 mm
Wheelbase	1,490 mm
Ground clearance	160 mm
Dry Weight	230 kg (without fuel and fluids)

Frame Specifications Table

Attribute	Value
Frame type	Tubular, double cradle
Rake / Caster angle	64 °
Trail length	90 mm

Engine Specifications Table

Attribute	Value
Power	82 HP @ 8,500 rpm
Torque	54.3 FT-LB @ 7,000 rpm
Engine capacity / displacement	903 cc
Engine configuration	DOHC 4-cylinder, transverse in-line 4-stroke, air-cooled
Arrangement	Transverse in-line
Bore and Stroke	66 mm x 66 mm
Compression ratio	8.5 : 1

Cylinder Head Specifications Table

Attribute	Value
Cylinder compression	121 psi
Cylinder head warpage	0.25 mm (service limit)

Valves and Springs Specifications Table

Attribute	Value
Intake valve stem diameter	6.965 mm - 6.980 mm
Intake valve stem diameter	6.86 mm (service limit)
Intake valve stem bend	0.5 mm (service limit)
Intake valve stem to guide clearance	0.02 mm - 0.05 mm
Intake valve stem to guide clearance	0.10 mm (service limit)
Exhaust valve stem diameter	6.955 mm - 6.970 mm
Exhaust valve stem diameter	6.85 mm (service limit)
Exhaust valve stem to guide clearance	0.03 mm - 0.06 mm
Exhaust valve stem to guide clearance	0.10 mm (service limit)
Intake valve spring free length	39.3 mm (outer spring)
	38.0 mm (outer spring service limit)
	36.0 mm (inner spring)
	35.0 mm (inner spring service limit)
Intake valve spring perpendicularity	1.9 mm (service limit)
Exhaust valve spring free length	39.3 mm (outer spring)
	38.0 mm (outer spring service limit)
	36.0 mm (inner spring)
	35.0 mm (inner spring service limit)
Exhaust valve spring perpendicularity	1.9 mm (service limit)

Camshaft and Timing Specifications Table

Attribute	Value
Intake valve cam timing	opens @ 30° BTDC @ 1.0 mm lift
Intake valve cam timing	closes @ 70° ABDC @ 1.0 mm lift
Intake cam lobe height	36.26 mm - 36.34 mm
Intake cam lobe height	36.16 mm (service limit)
Exhaust valve cam timing	opens @ 70° BBDC @ 1.0 mm lift
Exhaust valve cam timing	closes @ 30° ATDC @ 1.0 mm lift
Exhaust cam lobe height	35.76 mm - 35.84 mm
Exhaust cam lobe height	35.66 mm (service limit)
Camshaft run-out	0.10 mm (service limit)

Crankshaft Specifications Table

Attribute	Value
Crankshaft run-out	0.03 mm
Crankshaft run-out	0.10 mm (service limit)

Cylinder and Piston Specifications Table

Attribute	Value
Cylinder bore diameter	66.000 mm - 66.019 mm (bore)
Cylinder bore diameter	66.10 mm (bore service limit)
Piston diameter	65.93 mm - 65.95 mm (outer)
Piston diameter	65.80 mm (outer service limit)
Top piston ring to groove clearance	0.045 mm - 0.080 mm
Top piston ring to groove clearance	0.18 mm (service limit)
Second piston ring to groove clearance	0.010 mm - 0.050 mm
Second piston ring to groove clearance	0.15 mm (service limit)
Piston pin diameter	16.994 mm - 17.000 mm
Piston pin diameter	16.96 mm (service limit)
Piston pin bore diameter	17.0035 mm - 17.0115 mm
Piston pin bore diameter	17.08 mm (service limit)
Top piston ring groove width	1.50 mm - 1.52 mm
Top piston ring groove width	1.60 mm (service limit)
Second piston ring groove width	1.50 mm - 1.52 mm
Second piston ring groove width	1.60 mm (service limit)
Top piston ring end gaps	0.2 mm - 0.4 mm
Top piston ring end gaps	0.7 mm (service limit)
Cylinder to piston clearance	0.060 mm - 0.079 mm
Connecting rod big end side clearance	0.3 mm - 0.4 mm
Connecting rod big end side clearance	0.6 mm (service limit)

Clutch and Primary Drive Specifications Table

Attribute	Value
Reduction ratio	1.73 : 1 (97 / 56)
Clutch type	wet multi disc
Clutch spring free length	33.8 mm
Clutch spring free length	32.3 mm (service limit)
Plate warpage	0.30 mm (service limit
Friction plate thickness	3.7 mm - 3.9 mm
Friction plate thickness	3.4 mm (service limit)

Transmission Specifications Table

Attribute	Value
Type	5-speed, constant mesh, return shift
Gear ratio	1st gear = 3.17 : 1 (38 / 12)
	2nd gear = 2.19 : 1 (35 / 16)
	3rd gear = 1.67 : 1 (35 / 21)
	4th gear = 1.38 : 1 (29 / 21)
	5th gear = 1.22 : 1 (28 / 23)

Final Drive Specifications Table

Attribute	Value
Final drive	Chain drive
Final drive ratio	2.33 : 1 (35 / 15)
Chain type	EK630S-TG endless-type
Number of chain links	92 links
Length of 10 links	165.5 mm

Lubrication Specifications Table

Attribute	Value
System type	Forced lubrication
Oil capacity	3.3 litres (wet fill, includes filter)
	4.0 litres (wet fill, excludes filter)
	0.9 litres (tank volume)
Recommended oil approval rating	SE class
Oil viscosity	SAE 10W40

Fuel System Specifications Table

Attribute	Value
Fuel tank capacity	18 litres

Carburetion Specifications Table

Attribute	Value
Carburetor type	VM 28SC
Pilot jet	20
Main jet	112.5
Needle jet	P-8 mm

Ignition System Specifications Table

Attribute	Value
Ignition timing	1,500 rpm @ 5° BTDC to 3,000 rpm @ 40 ° BTDC
Spark plug type	NGK B-8ES

Front Suspension and Steering Specifications Table

Attribute	Value
Type	Telescopic fork
Front axel travel	140 mm
Recommended front fork oil grade	SAE 10W, non-detergent
Oil level	455 mm (fork fully compressed, sping removed)
Oil volume	169 ml (dry fill)
Spring free length	495.5 mm
Spring free length	485 mm (service limit)

Rear Suspension Specifications Table

Attribute	Value
Type	Swing arm
Rear axel travel	80 mm

Front Brake Specifications Table

Attribute	Value
Front brake type	Disc brake
Front master cylinder diameter	14.000 mm - 14.043 mm (inner)
Front master cylinder diameter	14.080 mm (inner service limit)
Front master piston diameter	13.957 mm - 13.984 mm (outer)
Front master piston diameter	13.900 mm (outer service limit)
Front caliper cylinder A diameter	38.180 mm - 38.200 mm (inner)
Front caliper cylinder A diameter	38.215 mm (inner service limit)
Front caliper piston A diameter	38.180 mm - 38.200 mm (outer)
Front caliper piston A diameter	38.105 mm (outer service limit)

Rear Brake Specifications Table

Attribute	Value
Rear brake type	Internal expansion, leading-trailing
Rear disc diameter	296 mm
Rear disc thickness	7.0 mm
Rear disc thickness	5.5 mm (service limit)
Rear disc run-out	0.3 mm (service limit)

Wheels and Tyres Specifications Table

Attribute	Value
Front wheel size	19 inch
Front tyre size	3.25-19 4PR
Front tyre pressure	26 psi (cold)
Recommended front tyre	Dunlop F6
Front wheel axle run-out	0.2 mm (service limit)
Front wheel rim axial run-out	3 mm (service limit)
Front wheel rim radial run-out	2 mm (service limit)
Rear wheel size	18 inch
Rear tyre size	4.00-18 4PR
Rear tyre pressure	31 psi (cold)
Recommended rear tyre	Dunlop K-87
Rear wheel axle run-out	0.2 mm (service limit)
Rear wheel rim radial run-out	3 mm (service limit)
Rear wheel rim axial run-out	2 mm (service limit)

Electrical Charging Specifications Table

Attribute	Value
Battery type	Yuasa
Battery voltage rating	12 volts DC

Electrical Equipment Specifications Table

Attribute	Value
Headlight	12V 50W/35W high/low beam
Recommended headlight	Semi-sealed
Tail / stop light	12V 4/32 cp 8/23W
Front turn signal light	12V 23W x 4
Rear turn signal light	12V 23W x 4
Neutral indicator	12V 3.4W
Turn signal indicator	12V 3.4W
High beam indicator	12V 3.4W
Oil pressure indicator	12V 3.4W

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1972-1975 Kawasaki Z1