1981 Suzuki GSX400



1979-1987 Suzuki GSX 400E Full Specifications

Get to know the 1979-1987 Suzuki GSX 400E 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 1979-1987 Suzuki GSX 400E specifications.


Performance Specifications Table

Minimum turing radius2,400 mm

Dimensions Specifications Table

Overall length2,075 mm
Overall width755 mm
Overall height1,075 mm
Wheelbase1,385 mm
Seat height815 mm
Ground clearance155 mm
Dry Weight175 kg (without fuel and fluids)

Frame Specifications Table

Rake / Caster angle62 °
Trail length105 mm

Engine Specifications Table

Engine capacity / displacement399 cc
Engine configuration4-stroke, air-cooled, DOHC
Bore and Stroke67 mm x 56.6 mm
Compression ratio10 : 1
Intake air filtrationPolyurethane foam element
Electric startyes

Cylinder Head Specifications Table

Cylinder compression142 psi - 199 psi
Intake valve seat width0.9 mm - 1.1 mm
Exhaust valve seat width0.9 mm - 1.1 mm

Valves and Springs Specifications Table

Intake valve lift7.0 mm
Intake valve stem to guide clearance0.025 mm - 0.052 mm
0.35 mm (service limit)
Intake valve head diameter0.5 mm (service limit)
Intake valve seat width0.9 mm - 1.1 mm
Exhaust valve lift7.0 mm
Exhaust valve stem to guide clearance0.040 mm - 0.067 mm
0.35 mm (service limit)
Exhaust valve head thickness0.5 mm (service limit)
Exhaust valve seat width0.9 mm - 1.1 mm
Intake valve spring free length35.5 mm (outer spring service limit)
31.9 mm (inner spring service limit)
Exhaust valve spring free length35.5 mm (outer spring service limit)
31.9 mm (inner spring service limit)

Valve Train Specifications Table

Drive typeChain driven
Tappet clearance (cold)0.08 mm - 0.13 mm

Camshaft and Timing Specifications Table

Camshaft journal diameter21.959 mm - 21.980 mm (outer)
Oil clearance0.032 mm - 0.066 mm
0.150 mm (service limit)

Crankshaft Specifications Table

Crankshaft run-out0.05 mm (service limit)

Cylinder and Piston Specifications Table

Cylinder bore diameter67.000 - 67.015 mm (bore)
67.080 mm (bore service limit)
Piston diameter66.945 mm - 66.960 mm (outer)
66.880 mm (outer service limit)
Top piston ring to groove clearance0.180 mm (service limit)
Second piston ring to groove clearance0.150 mm (service limit)
Piston pin bore diameter18.002 - 18.008 mm
18.030 mm (service limit)
Top piston ring groove width1.21 mm - 1.23 mm
Second piston ring groove width1.21 mm - 1.23 mm
Piston ring oil groove width2.51 mm - 2.53
Top piston ring end gaps0.10 mm - 0.30 mm
0.7 mm (service limit)
Second piston ring end gaps0.10 mm - 0.30 mm
0.7 mm (service limit)
Cylinder to piston clearance0.050 mm - 0.060 mm
0.120 mm (service limit)
Connecting rod small end diameter18.006 mm - 18.014 mm (inner)
18.040 mm (inner service limit)

Clutch and Primary Drive Specifications Table

Reduction ratio2.714 : 1 (76 / 28)
Clutch typeWet multi-plate type
Clutch spring free length38.4 mm (service limit)

Transmission Specifications Table

Type6-speed constant mesh
Gear ratio1st gear = 2.461 : 1 (32 / 13)
2nd gear = 1.777 : 1 ( 32 / 18)
3rd gear = 1.380 : 1 (29 / 21)
4th gear = 1.125 : 1 (27 / 24)
5th gear = 0.961 : 1 (25 / 26)
6th gear = 0.851 : 1 (23 / 27)
Gear shift pattern1-down, 5-up

Final Drive Specifications Table

Final drive ratio2.750 : 1 (44 / 16)
Chain typeDAIDO DID50UB
Number of chain links104 links

Lubrication Specifications Table

System typeWet sump

Fuel System Specifications Table

Fuel tank capacity14.5 litres
Reserve fuel tank capacity3 litres

Carburetion Specifications Table

Idle speed1,100 ± 50 rpm
Carburetor typeMIKUNI BS34SS, twin
Identification number44202
Pilot screw1 1/2 turn
Pilot jet42.5

Ignition System Specifications Table

TypeBattery ignition (for General) Fully transistorized (for the others)
Spark plug typeNGK D8EA/DR8ES-L or NIPPON DENSO X24ES-U/X24ESR-U

Front Suspension and Steering Specifications Table

TypeTelescopic, oil dampened
Front axel travel140 mm
Oil volume145 ml (left fork dry fill)
145 ml (right fork dry fill)

Rear Suspension Specifications Table

TypeSwing arm, oil dampened spring 5-way adjustable
Rear axel travel100 mm

Front Brake Specifications Table

Front brake typeDisc brake

Rear Brake Specifications Table

Rear brake typeInternal expanding

Wheels and Tyres Specifications Table

Front wheel size18 inch
Front tyre size3.00S18 4PR
Rear wheel size18 inch
Rear tyre size3.50S18 4PR

Electrical Charging Specifications Table

Battery voltage rating12 volts DC
Battery capacity12 ampere hour (Ah)


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