Suzuki RG400 (1985-86)

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The Suzuki RG400 was a two-stroke, square four-cylinder motorcycle produced from 1985-86. The engine had a capacity of 397cc and a compression ratio of 7.0:1. It featured a liquid cooling system and Suzuki CCI lubrication with oil pump injection. The induction system included 4 x 28mm Mikuni VM28SH flatslide carburetors, and it had a Suzuki PEI ignition with a kick start. The max power output was 43.1 kW/59 hp at 9000 rpm, and the max torque was 48 Nm/4.9 kgf-m/35.4 lb-ft at 8500 rpm. It used a wet, 8-plate clutch and a 6-speed transmission with a chain final drive. The frame had a double downtube, full cradle, box section aluminum perimeter frame, and a rake of 25.5o with a trail of 110mm/4.3in. It had air adjustable fork front suspension with 38mm tubes, adjustable spring preload, and anti-dive valving, as well as a full floating system rear suspension with an adjustable shock absorber for spring preload. The front brakes included 2 x 260mm discs with 4-piston calipers, and the rear brakes had a single 210mm disc with a 2-piston caliper. The dimensions of the motorcycle were a length of 2100mm/82.7in, width of 695mm/27.4in, height of 1185mm/46.7in, a wheelbase of 1425mm/56.1in, and a ground clearance of 120mm/4.7in with a seat height of 770mm/30.3in. The dry weight was 154kg/340lbs, while the wet weight was 181kg/399lbs with a fuel capacity of 22 liters/5.8 US gal/4.8 Imp gal, and a fuel reserve of 5 liters/1.3 US gal/1.1 Imp gal. It could reach a standing 1/4 mile in 11.8 seconds, standing 0-100 km/h in 4.9 seconds, and a top speed of 205 km/h/127.4 mph.

Technical specifications:

Make Model: Suzuki RG 400

Year: 1985 – 86


Engine: Two stroke, square four cylinder, rotary valve with exhaust port valves
Capacity: 397 cc / 24.2 cu in
Bore x Stroke: 50 x 50.6 mm
Compression Ratio: 7.0:1
Cooling System: Liquid cooled
Lubrication System: Suzuki CCI, oil pump injection
Induction: 4 x 28 mm Mikuni VM28SH Flatslide carburetors
Ignition: Suzuki PEI
Starting: Kick
Max Power: 43.1 kW / 59 hp @ 9000 rpm
Max Torque: 48 Nm / 4.9 kgf-m / 35.4 lb-ft @ 8500 rpm
Clutch: Wet, 8-plate
Transmission: 6 Speed
Final Drive: Chain
Frame: Double downtube, full cradle, box section aluminium perimetre frame

Rake: 25.5o
Trail: 110 mm / 4.3 in
Front Suspension: Air adjustable fork with 38mm tubes, adjustable spring preload and anti dive valving.
Front Wheel Travel: 130 mm / 5.1 in
Front Suspension: Air adjustable fork with 38mm tubes, adjustable spring preload and anti dive valuing.
Rear Suspension: Full floating system, shock absorber, adjustable for spring preload
Rear Wheel Travel: 127 mm / 5.0 in
Front Brakes: 2 x 260 mm Discs, 4-piston calipers
Rear Brakes: Single 210 mm disc, 2-piston caliper
Front Tyre: 110/90 V16
Rear Tyre: 120/90 V17
Dimensions: Length: 2100 mm / 82.7 in Width: 695 mm / 27.4 in Height: 1185 mm / 46.7 in
Wheelbase: 1425 mm / 56.1 in
Ground Clearance: 120 mm / 4.7 in
Seat Height: 770 mm / 30.3 in
Dry Weight: 154 kg / 340 lbs
Wet Weight: 181 kg / 399 lbs
Fuel Capacity: 22 Litres / 5.8 US gal / 4.8 Imp gal
Fuel Reserve: 5 Litres / 1.3 US gal / 1.1 Imp gal
Standing 1/4 Mile: 11.8 sec

Standing: 0 – 100 km/h: 4.9 sec
Top Speed: 205 km/h / 127.4 mph

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