# Honda CB400SF

The Honda CB400 Super Four is a CB series 399 cc (24.3 cu in) standard 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.

## Model history

Unveiled in 1991 at the 29th Tokyo Motor Show as a 400 cc version of the 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.

### 1992–1998

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 of a constant velocity design. 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. Version S model also received electronically controlled ignition (PGM-IG). Weight increased by 1 kg (2.2 lb).

### 1999–2001

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).
2000: Stronger combination switch to deter theft.

### 2002–2003

2002: The CB400SF Hyper VTEC Spec II changed the operation of the VTEC system to trigger at 6,300 rpm along with updated ignition timing map. An LCD odometer/trip-meter and clock + fuel gauge were integrated in the speedometer and tachometer faces respectively, as well as adding the HISS ignition security system. Air intake noise was reduced by enhancing the surface rigidity of the air cleaner case. Lighter, smaller oil filter and front brake calipers were lifted from the super-sport CBR900RR. Chipping guards were added to the front fork tubes. Weight increased by 1 kg (2.2 lb).

### 2004–2007

2004: The CB400SF Hyper VTEC Spec III further changed the operation of the VTEC system to trigger at 6,750 rpm in 6th gear, remaining at 6,300 rpm in gears 1–5, along with further updated ignition timing map. Increased quantity of glass wool in the exhaust pipe collector reduces exhaust noise to 72 dB to comply with government regulations. A new lower seat with single grab rail instead of surface belt, light rear brake caliper and updated front suspension offer better ergonomics. Multi-reflector headlight, LED tail-lights, new fuel tank and rear cowl provide improved safety and styling. Weight increased by 1 kg (2.2 lb).
2005: Added analogue pre-load adjustment mechanism for the front suspension and high-density polyurethane material for the seat cushion. From 2005, the CB400 Super Bol d'Or has been available with a half-fairing in Japan and later in SE Asia as well.
2006: Larger ignition coils supply a more stable spark at lower rpms; clear smoke lenses on the turn indicator lights.

### 2008–October 2022

2008: The CB400SF Hyper VTEC Revo introduced Honda's PGM-FI programmed fuel injection and an idle air control valve for improved fuel economy and reliability. Revised engine materials and an integrated crank-case cover reduced the engine weight by 2 kg (4.4 lb). The VTEC operation was further refined such that in gears 1–5 four-valve operation engaged at 6,300 rpm for wide open throttle, otherwise at 6,750 rpm, and remaining at 6,750 rpm in 6th gear. Independent cylinder ignition timing map, revised air intake geometry and a larger stainless steel muffler contribute to fuel efficiency. Updated frame rigidity and engine mounting position improved handling. Optional combined ABS uses three-piston sliding calipers on the front brakes instead of the standard four-piston opposed calipers and a larger 256 mm rear brake disc. Weight increased by 4 kg (8.8 lb), and 9 kg (20 lb) with ABS.
2014: Central LCD screen with gear position, fuel consumption, thermometer and heater level for the handle grips (available with the "E Package"), 10-spoke wheels, round mirrors and dual grab rails on a revised rear cowl with LED rear lights and clear lens. Revised frame geometry brought the handlebars 10 mm higher and 7 mm closer to the rider, and also reduced the rise angle of the tail end, both changes resulting in a more upright riding position. Revised half-fairing with LED headlight for the Super Bol d'Or. Weight increased by 3 kg (6.6 lb).
Genuine accessories available from Honda include a rear carrier storage box that installs in place of the dual grab rails, a 12V power socket that plugs into the wiring harness, and a central stand.
2018: 25th anniversary model of Honda's PROJECT BIG 1 (SuperFour since 1992), smaller 2-chamber muffler and updated throttle bodies to comply with emissions regulations, also increased the maximum power to 41 kW (55 hp). LED headlight, updated front and rear suspension, right-angle tyre valve stems, and push type helmet lock bracket. Super Bol d'Or is available with ABS only. Weight increased by 2 kg (4.4 lb).

## Specifications

All specifications are manufacturer claimed unless otherwise specified. The motorcycle model designation is printed on a sticker under the seat.
| Model | Super Four | SF Hyper VTEC | SF Hyper VTEC Spec II | SF Hyper VTEC Spec III | SF Hyper VTEC Revo |
| Years | 1992–1998 | 1999–2001 | 2002–2003 | 2004–2007 | 2008–present |
| Availability | Japan, SE Asia | Japan, SE Asia | Japan, SE Asia | Japan, SE Asia | Japan, SE Asia, Australia (2008–2016) |
| Engine | NC23E | NC39 | NC39 | NC39 | NC42E |
| four-stroke inline-4, DOHC, 16 valves, liquid-cooled |||||
| Displacement | 399 cc (24.3 cu in) | 399 cc (24.3 cu in) | 399 cc (24.3 cu in) | 399 cc (24.3 cu in) | 399 cc (24.3 cu in) |
| Bore × stroke | 55.0 mm × 42.0 mm (2.17 in × 1.65 in) | 55.0 mm × 42.0 mm (2.17 in × 1.65 in) | 55.0 mm × 42.0 mm (2.17 in × 1.65 in) | 55.0 mm × 42.0 mm (2.17 in × 1.65 in) | 55.0 mm × 42.0 mm (2.17 in × 1.65 in) |
| Compression ratio | 11.3:1 | 11.3:1 | 11.3:1 | 11.3:1 | 11.3:1 |
| Fuel delivery | Keihin VP22 32 mm carburetors ×4 | Keihin VP04 32 mm carburetors ×4 | Keihin VP04B 32 mm carburetors ×4 | Keihin VP04B 32 mm carburetors ×4 | Honda PGM-FI |
| Ignition | Fully transistorized | Fully transistorized | Fully transistorized | Fully transistorized | Fully transistorized with ignition advance |
| Maximum power | 39 kW (53 PS) at 11,000 rpm | 39 kW (53 PS) at 11,000 rpm | 39 kW (53 PS) at 11,000 rpm | 39 kW (53 PS) at 11,000 rpm | 39 kW (53 PS) at 10,500 rpm (2008–17) 41 kW (56 PS) at 11,000 rpm (2018–2022) |
| Maximum torque | 36 N⋅m (27 lb⋅ft) at 10,000 rpm | 38 N⋅m (28 lb⋅ft) at 9,500 rpm | 38 N⋅m (28 lb⋅ft) at 9,500 rpm | 38 N⋅m (28 lb⋅ft) at 9,500 rpm | 38 N⋅m (28 lb⋅ft) at 9,500 rpm (2008–17) 39 N⋅m (29 lb⋅ft) at 9,500 rpm (2018–2022) |
| Transmission | 6-speed sequential, constant mesh | 6-speed sequential, constant mesh | 6-speed sequential, constant mesh | 6-speed sequential, constant mesh | 6-speed sequential, constant mesh |
| Clutch | Wet, multi-plate, coil spring | Wet, multi-plate, coil spring | Wet, multi-plate, coil spring | Wet, multi-plate, coil spring | Wet, multi-plate, coil spring |
| Final drive | 525 o-ring chain | 525 o-ring chain | 525 o-ring chain | 525 o-ring chain | 525 o-ring chain |
| Frame | Tubular steel, double cradle | Tubular steel, double cradle | Tubular steel, double cradle | Tubular steel, double cradle | Tubular steel, double cradle |
| Rake | 27°15' | 25°15' | 25°15' | 25°05' | 25°05' |
| Trail | 109 mm (4.3 in) | 89 mm (3.5 in) | 89 mm (3.5 in) | 90 mm (3.5 in) | 90 mm (3.5 in) |
| Turning radius | 2.6 m (8 ft 6 in) | 2.6 m (8 ft 6 in) | 2.6 m (8 ft 6 in) | 2.6 m (8 ft 6 in) | 2.6 m (8 ft 6 in) |
| Front wheel | 17M/C × MT3.00 | 17M/C × MT3.50 | 17M/C × MT3.50 | 17M/C × MT3.50 | 17M/C × MT3.50 |
| Rear wheel | 17M/C × MT4.00 | 17M/C × MT4.50 | 17M/C × MT4.50 | 17M/C × MT4.50 | 17M/C × MT4.50 |
| Front tyre | 110/70 –17 54H | 120/60 ZR17 55W | 120/60 ZR17 55W | 120/60 ZR17 55W | 120/60 ZR17 55W |
| Rear tyre | 140/70 –17 66H | 160/60 ZR17 69W | 160/60 ZR17 69W | 160/60 ZR17 69W | 160/60 ZR17 69W |
| Front brake | Dual 296 mm floating discs | Dual 296 mm floating discs | Dual 296 mm floating discs | Dual 296 mm floating discs | Dual 296 mm floating discs, combined ABS |
| Rear brake | Single 240 mm disc | Single 240 mm disc | Single 240 mm disc | Single 240 mm disc | Single 256 mm disc, combined ABS |
| Wheelbase | 1,455 mm (57.3 in) | 1,415 mm (55.7 in) | 1,410 mm (56 in) | 1,410 mm (56 in) | 1,410 mm (56 in) |
| Overall length | 2,085 mm (82.1 in) | 2,050 mm (81 in) | 2,050 mm (81 in) | 2,040 mm (80 in) | 2,040 mm (80 in) |
| Overall width | 735 mm (28.9 in) | 725 mm (28.5 in) | 725 mm (28.5 in) | 725 mm (28.5 in) | 725 mm (28.5 in) |
| Overall height | 1,080 mm (43 in) | 1,070 mm (42 in) | 1,070 mm (42 in) | 1,070 mm (42 in) 1,155 mm (45.5 in) (Bol d'Or) | 1,070 mm (42 in) 1,155 mm (45.5 in) (Bol d'Or) |
| Seat height | 770 mm (30 in) | 760 mm (30 in) | 760 mm (30 in) | 755 mm (29.7 in) | 755 mm (29.7 in) |
| Ground clearance | 125 mm (4.9 in) | 130 mm (5.1 in) | 130 mm (5.1 in) | 130 mm (5.1 in) | 130 mm (5.1 in) |
| Fuel tank capacity | 18 L (4.0 imp gal; 4.8 US gal) | 18 L (4.0 imp gal; 4.8 US gal) | 18 L (4.0 imp gal; 4.8 US gal) | 18 L (4.0 imp gal; 4.8 US gal) | 18 L (4.0 imp gal; 4.8 US gal) |
| Engine oil | 3.6 L (0.79 imp gal; 0.95 US gal) | 3.8 L (0.84 imp gal; 1.0 US gal) | 3.8 L (0.84 imp gal; 1.0 US gal) | 3.8 L (0.84 imp gal; 1.0 US gal) | 3.8 L (0.84 imp gal; 1.0 US gal) |
| Dry weight | 172 kg (379 lb) (1992–3) 173 kg (381 lb) (1994–6) 174 kg (384 lb) (1997–8) | 168 kg (370 lb) | 169 kg (373 lb) | 170 kg (370 lb) | |
| Wet weight | 192 kg (423 lb) (1992–3) 193 kg (425 lb) (1994–6) 194 kg (428 lb) (1997–8) | 188 kg (414 lb) | 189 kg (417 lb) | 190 kg (420 lb) | 194 kg (428 lb), +5 kg (11 lb) ABS, +4 kg (8.8 lb) Bol d'Or (2008–13) 197 kg (434 lb), +3 kg (6.6 lb) ABS, +3 kg (6.6 lb) Bol d'Or (2014–17) 199 kg (439 lb), +3 kg (6.6 lb) ABS, +3 kg (6.6 lb) Bol d'Or (2018–) |
| Fuel consumption | 34.7 km/L (98 mpg$_{‑imp}$; 82 mpg$_{‑US}$) | 37 km/L (100 mpg$_{‑imp}$; 87 mpg$_{‑US}$) | 37 km/L (100 mpg$_{‑imp}$; 87 mpg$_{‑US}$) | 37 km/L (100 mpg$_{‑imp}$; 87 mpg$_{‑US}$) | 31 km/L (88 mpg$_{‑imp}$; 73 mpg$_{‑US}$) |