Honda CB400SF
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| Manufacturer | Honda |
|---|---|
| Production | 1992-present |
| Predecessor | Honda CB400N |
| Class | Naked bike |
| Engine | NC42E Four-stroke inline-4, DOHC, 16 valves, liquid-cooled |
| Bore / stroke | 55 mm × 42 mm (2.17 in × 1.65 in) |
| Compression ratio | 11.3:1 |
| Power | 39.5 kW (53.0 hp) @ 10,500 rpm |
| Torque | 38 N·m (28 lbf·ft) @ 9,500 rpm |
| Transmission | 6-speed, wet multi-plate clutch, chain drive |
| Wheelbase | 1,410 mm (56 in) |
| Dimensions |
L: 2,040 mm (80 in) W: 725 mm (28.5 in) H: 1,070 mm (42 in) |
| Seat height | 755 mm (29.7 in) |
| Weight | 200 kg (440 lb) (wet) |
| Fuel capacity | 18 L (4.0 imp gal; 4.8 US gal) |
| Related | Honda CB1000SF |
The Honda CB400 Super Four is a motorcycle produced by Honda at the Kumamoto plant from 1992 to the present. The CB400 embodies the typical Universal Japanese Motorcycle produced through the 1970s, updated with modern technology. To this end, the bike has a naked retro design, paired with a smooth inline-four engine. Originally a Japan-only bike, it was later also available in SE Asia, and from 2008 in Australia.
Unveiled in 1991 at the 29th Tokyo Motor Show as a 400 cc version of the popular CB1000 Super Four, the motorcycle was introduced in Japan for the 1992 model year, with an engine similar to that of the early CB-1.
1992: The CB400 Super Four introduced the updated CB-1 engine, tilted backwards to obtain a more erect cylinder bank. Carburetors changed from down-draft to side-draft type, but still CV. A more conventional chain drive system replaced the gear cam drive system, setting the red-line at 12,500 rpm. Wider gear ratios defined the versatility of Honda's intention for the bike.
1994: Updates to the ignition timing due to adoption of the pent-roof combustion chamber design, the internal structure of the muffler, and the shape of the cam chain links for reduced mechanical noise. The engine mount location was updated for improved handling. A new instrument cluster appeared with the analogue fuel gauge moved to a central location from previously within the tachometer face, a row of indicator LEDs below the clocks, and a hazard light switch. Weight increased by 1 kg (2.2 lb).
1995: More cooling fins were added on the lower side portion of the cylinder bank.
A special edition Super Four version R model offered PGM-IG programmed ignition timing along with electronic controlled valve operation, in addition to a headlight cowl, sharper rake angle, lightweight aluminium muffler, stiffer suspension and sintered brake pads.
1996: New front brake discs with reduced tendency to warp, and opposed four-piston calipers for improved initial response.
A special edition Super Four version S model was available with Brembo brakes and Showa suspension.
1997: Updates to the carburetor air funnels, the internal muffler structure, and the Nissin brakes. Weight increased by 1 kg (2.2 lb).
1999: The CB400SF Hyper VTEC introduced major engine improvements through the use of Honda's VTEC system. While having four valves per cylinder, below 6750 rpm one intake and exhaust pair are disabled. This technique improved the engine's low and mid-range power and efficiency, while retaining performance over 6,750 rpm by resuming four valve operation. The light-weight aluminium muffler (previously special edition), 40 mm shorter wheelbase, 10 mm lower engine mount position, and front suspension lifted from the super-sport CBR900RR resulted in improved handling. Weight reduced by 6 kg (13 lb).
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