Suzuki GSX400F (1985-86)

The Suzuki GSX400F Katana was a motorcycle produced between 1985 and 1986. It had a four-stroke, transverse four-cylinder, DOHC engine that had 4 valves per cylinder with a capacity of 398cc. The compression ratio was 10.2:1, and the cooling system was air-cooled with a wet sump lubrication system. The bike had 4 x Mikuni BS26SS carburetors and fully transistorized ignition with an electric starter that was powered by a 12V 12Ah battery. The maximum power output was 30.8 kW or 41.3 hp at 10,500 rpm with a maximum torque of 30.2 Nm or 3.1 kgf-m or 22.3 lb-ft at 8500 rpm. It had a wet, multiplate clutch and a 6-speed transmission with a chain final drive. The front suspension was telescopic fork oil dampened with a front wheel travel of 150mm and the rear a swingarm, dual shocks, oil dampened, and a spring 5-way adjustable with a travel of 107mm. Brakes were 2 x discs on the front and a single disc on the rear with a steering angle of 42 degrees. The bike had a length of 2105mm, width of 750mm, height of 1135mm, wheelbase of 1415mm, and ground clearance of 165mm. The seat height was 780mm, and the dry weight of the bike was 179kg.

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Technical specifications:

Make Model: Suzuki GSX 400F Katana

Year: 1985-86

Engine: Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder.

Capacity: 398 cc / 24.3 cu in

Bore x Stroke: 53 x 45.2 mm

Compression Ratio: 10.2:1

Cooling System: Air cooled

Lubrication System: Wet sump

Induction: 4 x Mikuni BS26SS carburetors

Ignition: Fully transistorised

Starting: Electric

Battery: 12V, 12Ah

Spark Plug: NGK D8EA, NIPPON DENSO X24ES-U

Max Power: 30.8 kW / 41.3 hp @ 10500 rpm

Max Torque: 30.2 Nm / 3.1 kgf-m / 22.3 lb-ft @ 8500 rpm

Clutch: Wet, multiplate

Transmission: 6 Speed

Final Drive: Chain, DAIDO DID50UB, 104 links

Primary Reduction: 2.300 (92/40)

Final Reduction: 2.866 (43/15)

Gear Ratios: 1st 3.166 (38/12) / 2nd 2.125 (34/16) / 3rd 1.631 (31/19) / 4th 1.333 (28/21) / 5th 1.173 (27/23) / 6th 1.083 (26/24)

Front Suspension: Telescopic fork, oil dampened

Front Wheel Travel: 150 mm / 5.9 in

Rear Suspension: Swingarm, dual shocks, oil dampened, spring 5-way adjustable

Rear Wheel Travel: 107 mm / 4.2 in

Front Brakes: 2 x Discs

Rear Brakes: Single disc

Front Tyre: 3.25-S19 4PR

Rear Tyre: 3.75-S18 4PR

Steering Angle: 42~A degrees (left and right)

Caster: 63~A degrees

Trail: 100 mm / 3.9 in

Dimensions: Length: 2105 mm / 82.9 inWidth: 750 mm / 29.5 in Height: 1135 mm / 44.7 in

Wheelbase: 1415 mm / 55.7 in

Ground Clearance: 165 mm / 6.5 in

Seat Height: 780 mm / 30.7 in

Turning Radius: 2.3 m / 7.5 ft

Dry Weight: 179 kg / 395 lbs