These are the known mechanical and performance specifications for your 1979 Kawasaki KZ 400 LTD.
Basic Specs

Engine
Displacement398.00 ccm (24.29 cubic inches)
Type
DetailsTwin, four-stroke
Max RPM9000
Compression9.5:1
Bore/Stroke64.0 x 62.0 mm (2.5 x 2.4 inches)
Valves/Cylinder2
FuelingCarburettor. Keihin VB32SS x2
Ignition
Exhaust2 in to 2
Lubricationwet sump
CoolingAir
Performance
Horespower36.00 HP (26.3 kW)
Torque3.20 Nm (0.3 kgf-m or 2.4 ft.lbs)
Top Speed
Fuel Economy & Polution
Fuel Consumption
Fuel Capacity12.00 litres (3.17 gallons)
Emissions
Chassis
Frame Type
Rake
Trail
Front Suspension
Front Travel
Rear Suspension
Rear Travel
Seat
Seat Height
Alt. Seat Height
Total Height
Total Length
Total Width
Ground Clearance
Wheelbase
Dry Weight170.0 kg (374.8 pounds)
Wet Weight
Wheels & Brakes
Front Tire/Tyre
Rear Tire/Tyre
Front BrakesSingle disc
Front Brake Diameter
Rear BrakesExpanding brake (drum brake)
Rear Brake Diameter
Wheels
Comments
not sure why I have to submit this bike again but here it is.