| MODEL | HONDA CBR 400RR 1990 |
| Year | 1990 |
| Engine Type | Four stroke, transverse four cylinder, DOHC, 4 valves per cylinder |
| Displacement / Capacity | 399 cc / 24.3 cu in |
| Bore X Stroke | 55 x 42 mm |
| Compression Ratio | 11.3:1 |
| Cooling System | Liquid cooled, radiator with cooling fan |
| Max Power | 42.2 kW / 59 hp @ 12500 rpm |
| Max Torque | 39 Nm / 28.8 lb-ft @ 10000 rpm |
| Ignition | Digital full-transistor ignition |
| Induction | 4x 26 mm flat-side CV carburettors |
| Start System | Electric |
| TRANSMISSION SPECS | |
| Lubrication | Forced pressure, wet sump |
| Gear Box | 6 Speed |
| Clutch | Wet multi-plate |
| Final Drive | Chain |
| CHASSIS SPECS | |
| Frame | Twin-spar box-section aluminium |
| Front Suspension | 41 mm Showa damper-rod forks, adjustable preload |
| Rear Suspension | Showa gas/oil shock, adjustable preload and compression |
| Front Brakes | 2x 275 mm discs, 4-piston calipers |
| Rear Brakes | Single 220 mm disc, 2-piston caliper |
| DIMENSION SPECS | |
| Overall Length | 1990 mm / 78.3 in |
| Overall Width | 670 mm / 26.4 in |
| Overall Height | 1080 mm / 42.5 in |
| Seat Height | 750 mm / 29.5 in |
| Wheelbase | 1375 mm / 54.1 in |
| Ground Clearance | 125 mm / 4.9 in |
| Dry Weight | 163 kg / 359.4 lbs |
| Wet Weight | — |
| WHEEL SPECS | |
| Front Tyre | 120/60-17 |
| Rear Tyre | 150/60-18 |
| FUEL SYSTEM | |
| Fuel Capacity | 15 Litres / 4.0 US gal |
| Fuel Consumption | — |
| Top Speed | — |
The 1990 CBR400RR (NC29) was a major rework, with a frame designed around the engine, a low centre of gravity and a curved 'gull-arm' swingarm. Testers liked its smooth, progressive gear-cam engine, quick steering and quality finish, but found the rear shock too soft for heavier riders.
