Kawasaki Z1-B

Kawasaki Z1-B

Model: Kawasaki Z1-B

Key Specifications:

  • Years: The Kawasaki Z1-B was produced in the early 1970s.
  • Engine: It featured a four-stroke, transverse four-cylinder engine.
  • Capacity: The engine displacement was 903 cc, making it a powerful motorcycle.
  • Bore x Stroke: The engine had a bore and stroke measurement of 66 x 66 mm.
  • Cooling System: The Z1-B used an air-cooling system, a common feature in motorcycles from that era.
  • Compression Ratio: The compression ratio was 8.5:1, contributing to the engine’s efficiency.
  • Lubrication: It utilized a wet sump lubrication system with a trachoid pump.
  • Air Filtration: Equipped with a treated synthetic fiber air filtration system.
  • Induction: Featured 4 x 28mm Mikuni VM28SC carburetors for fuel delivery.
  • Ignition: The ignition system comprised a battery and coil.
  • Starting: The Z1-B had both electric and kick start options.
  • Max Power: It produced a maximum power of 82 hp (59.8 kW) at 8500 rpm.
  • Max Torque: The peak torque was 73.5 Nm (54.3 lb-ft) at 7000 rpm.
  • Clutch: Equipped with a wet, multi-plate clutch.
  • Transmission: Featured a 5-speed gearbox for versatile riding.
  • Final Drive: Used a chain final drive for power transfer to the rear wheel.
  • Primary Drive: Utilized straight cut gears for efficient power transmission.
  • Frame: The Z1-B featured a double tubular steel cradle frame for strength and stability.
  • Suspension: Front suspension comprised 36mm telescopic forks, and the rear had dual shocks with 5-way preload adjustment.
  • Brakes: Front brakes included a single 296mm disc with a 2-piston caliper, while the rear had a 200mm drum brake.
  • Wheels and Tires: Equipped with a 3.25 H19 front tire and a 4.00 S18 rear tire.
  • Rake: The rake angle was 27 degrees.
  • Trail: It had a trail measurement of 3.75 inches.
  • Dimensions: Length was 2209.8 mm (87.0 in), wheelbase 1498.6 mm (59.0 in), handlebar width 818 mm (32.2 in), seat height 812.8 mm (32.0 in), and ground clearance 170 mm (6.75 in).
  • Weight: The dry weight was 230 kg (507 lbs), and wet weight was 247.6 kg (546 lbs).
  • Fuel Capacity: The fuel tank had a capacity of 18 liters (4.7 gallons).
  • Fuel Consumption: Averaged around 48 mpg.
  • Braking Distance: It could come to a stop from 30 mph in 29.00 ft and from 60 mph in 126.00 ft.
  • Acceleration: It could accelerate from 0 to 30 mph in 2.7 seconds and from 0 to 60 mph in 4.8 seconds.
  • Standing ¼ Mile: Completed in 12.3 seconds at a speed of 112 mph.
  • Top Speed: The top speed of the Kawasaki Z1-B was 135 mph.

The Kawasaki Z1-B was a powerful and iconic motorcycle, known for its performance and contribution to the superbike category during the 1970s.

EngineFour-stroke, transverse four-cylinder, DOHC, 2 valve per cylinder
Capacity903 cc / 55.1 cu-in
Bore x Stroke66 x 66 mm
Cooling SystemAir cooled
Compression Ratio8.5:1
LubricationWet sump, trachoid pump
Air FiltrationTreated synthetic fiber
Induction4 x 28mm Mikuni VM28SC
IgnitionBattery and coil
StartingElectric & kick
Max Power82 hp / 59.8 kW @ 8500 rpm
Max Torque73.5 Nm / 54.3 lb-ft @ 7000 rpm
ClutchWet, multi-plate
Transmission5 Speed
Final DriveChain
Primary DriveStraight cut gears
Gear Ratio1st 12.79:1, 2nd 8.84:1, 3rd 6.74:1, 4th 5.58:1, 5th 4.92:1
FrameDouble tubular steel cradle
Front Suspension36mm Telescopic forks
Rear SuspensionDual shock, 5-way preload adjustment
Front BrakesSingle 296mm disc, 2 piston caliper
Rear Brakes200mm drum
Front Tyre3.25 H19
Rear Tyre4.00 S18
Trail3.75 in.
DimensionsLength 2209.8 mm / 87.0 in., Wheelbase 1498.6 mm / 59.0 in, Handlebar Width 818 mm / 32.2 in., Seat Height 812.8 mm / 32.0 in., Ground Clearance 170 mm / 6.75 in.
WeightDry Weight 230 kg / 507 lbs, Wet Weight 247.6 kg / 546 lbs
Fuel Capacity18 Litres / 4.7 gal
Consumption Average48 mpg
Braking Distance 30 mph – 029.00 ft.
Braking Distance 60 mph – 0126.00 ft.
Acceleration 0-30 mph2.7 sec
Acceleration 0-60 mph4.8 sec
Standing ¼ Mile12.3 sec / 112 mph
Top Speed135 mph
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