| Engine | Honda CB400F | Honda CB400SF |
|---|---|---|
| Engine code | NC42E | |
| Displacement | 408 cc | 399 cc |
| Max power | 37 hp (@8 500 RPM) | 53 hp (@10 500 RPM) |
| Max torque | 24 lb ft (@7 500 RPM) | 28 lb ft (@9 500 RPM) |
| Redline | 10 000 RPM | 13 000 RPM |
| Idling speed | 1 200 RPM | 1 400 RPM |
| Management | Carburetor | Fuel Injection |
| Layout | SOHC Inline-4 | DOHC Inline-4 |
| Compression | 9.40:1 | 11.30:1 |
| Oil capacity | 3.31 quart | 3.60 quart |
| Spark plug type | NKG CR8EH9, DENSO U24FER9 | |
| Cooling | Liquid | Liquid |
| Valves | 8 | 16 |
| Bore | 51.0 mm | 55.0 mm |
| Stroke | 50.0 mm | 42.0 mm |
| Throttle bore | 20.0 mm | |
| Weight to power | 10.61 lbs/hp | 8.11 lbs/hp |
| Power to weight | 235 hp/2500lbs | 308 hp/2500lbs |
| Battery type | 12V 12Ah | 12V - 8.6Ah |
| Gearbox | Honda CB400F | Honda CB400SF |
|---|---|---|
| Type | Sequential | Sequential |
| Clutch | Wet | Wet |
| Drive | Chain | Chain |
| Chain type | ||
| Gears count | 6 | 6 |
| Primary ratio | 3.423 | 2.171 |
| Final drive | 2.235 | 2.933 |
| 1. gear | 2.733 (35 mph) | 3.307 (45 mph) |
| 2. gear | 1.8 (54 mph) | 2.294 (65 mph) |
| 3. gear | 1.375 (71 mph) | 1.75 (85 mph) |
| 4. gear | 1.111 (88 mph) | 1.421 (105 mph) |
| 5. gear | 0.965 (101 mph) | 1.24 (120 mph) |
| 6. gear | 0.866 (112 mph) | 1.13 (132 mph) |
| Chasis | Honda CB400F | Honda CB400SF |
|---|---|---|
| Frame type | Tubular downtube cradle | Tubular steel, double cradle |
| Front susp. | Telescopic fork | |
| Rear susp. | Swingarm, two spring shocks |