Honda CBR400RR (1991)

The Honda CBR400RR motorcycle, released in 1991, has a four-stroke transverse four-cylinder engine with a capacity of 399 cc. It features a liquid-cooling system with a radiator and cooling fan, and a Trockoid oil pump. The bike has a maximum power output of 59 hp at 12500 rpm and a torque of 39 Nm at 10000 rpm. It has a six-speed transmission and final drive chain with a primary drive of 2.117. The frame is a twin-spar, box-section aluminum. It has a Showa damper-rod front fork suspension and Showa gas/oil shock rear suspension with adjustable preload and compression. The front brakes are two 275mm discs with four-piston calipers, while the rear brake is a single 220mm disc with two-piston caliper. It has a rake angle of 24.3 degrees and a trail of 91mm. The length of the bike is 1990mm, width 670mm, and height 1080mm. The wheelbase measures 1375mm, seat height is 750mm, and dry weight is 163kg. It has a fuel capacity of 15 litres and a ground clearance of 125mm. This model was tested and reviewed by Moto Sprint in 1991.

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Technical specifications:

Make Model: Honda CBR 400RR

Year: 1991

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

Capacity: 399 cc / 24.3 cu-in

Valve: Intake valve closes @ 1mm lift / Exhaust valve opens @ 1mm lift

Bore x Stroke: 55 x 42 mm

Cooling System: Liquid cooled; radiator with cooling fan

Compression Ratio: 11.3:1

Lubrication: Forced pressure and wet sump

Oil Pump Type: Trockoid

Oil Capacity: 3.8 Liters

Induction: 4x 26mm Flat-side CV

Charging: Triple phase output alternator

Ignition: Digitalized full transistor ignition

Spark Plug: NGK CR9EH-9 or ND U27FER-9

Battery: 12v (6AH) YTX7A-BS

Starting: Electric

Max Power: 59 hp / 42.2 kW @ 12500 rpm

Max Torque: 39 Nm / 28.8 ft-lb @ 10000 rpm

Clutch: Multi-plate, wet

Transmission: 6 Speed

Final Drive: Chain

Primary Drive: 2.117

Gear Ratio: 1st 3.307: 1 (43/13) 2nd 2.352: 1 (40/17) 3rd 1.875 (30/16) 4th 1.591 (35/22)3 5th 1.435 (33/23) 6th 1.318 (29/22)

Frame: Twin-spar, box-section aluminum

Front Suspension: 41mm Showa damper-rod forks with adjustable pre-load

Rear Suspension: Showa gas/oil shock with adjustable preload and compression

Front Brakes: 2x 275mm discs 4 piston calipers

Rear Brakes: Single 220mm disc 2 piston caliper

Font Wheel: 17×3.5 in.

Rear Wheel: 17×4.5 in.

Front Tyre: 120/60-17

Rear Tyre: 150/60-18

Rake: 24.3 degrees

Trail: 91 mm / 3.6 in

Dimensions: Length 1990mm / 78.3 in width 670mm / 26.4 in Height 1080 mm / 42.5 in

Wheelbase: 1375mm / 54.1 in

Seat Height: 750 mm / 29.5 in

Dry Weight: 163 kg / 359.4 lbs

Ground Clearance: 125 mm / 4.9 in

Fuel Capacity: 15 Litres / 4.0 gal

Road Test: Moto Sprint 1991