Honda CB250N/CB400N

The Honda CB250N and CB400N Super Dream are motorcycles manufactured by the Honda Motor Company from 1978 to 1986. The successor to the short lived Dream model, it had a series of revisions including a six-speed transmission and what Honda termed as European styling [6] which resembled the CB750F and CB900F. It was a popular model for Honda with 70,000 bikes sold in the UK alone.[7]

Honda CB250N (CB400N)
Honda CB400N in the Honda Collection Hall
ManufacturerHonda Motor Company
Also calledSuper Dream
Production1978–1986
PredecessorHonda CB250T/CB400T Dream
SuccessorHonda CB450DX-K
ClassStandard
EngineAir-cooled four-stroke, parallel-twin, three valves per cylinder, sohc
Bore / stroke62.0 mm × 41.4 mm (2.44 in × 1.63 in) (250N)[1]
70.5 mm × 50.6 mm (2.78 in × 1.99 in) (400N)[2]
Compression ratio9.4:1 (250N)
9.3:1 (400N)[2]
Top speed83 mph (134 km/h) [3] (CB250N)
103.44 mph (166.47 km/h)[4] (CB400N)
Power27 bhp (20 kW)[3] @ 10,000rpm (250N)
43 bhp (32 kW) @ 9,500rpm (400N)[4]
Torque14.7 lb⋅ft (19.9 N⋅m)[3] @ 8,500rpm (250N)
24.5 lb⋅ft (33.2 N⋅m)[4] @ 8,000rpm (400N)
Ignition typeCapacitor discharge electronic ignition, electric start, kick start (N variant only)
Transmission6-speed, chain drive manual
SuspensionFront: telescopic forks;
Rear: swingarm with twin shock absorbers (adjustable for pre-load)
BrakesSingle-disc front, single piston caliper; drum rear (250N)
Twin discs front; drum rear (400N)
Tyres3.60S19-4PR front, 4.10S18-4PR rear[5]
Wheelbase1.395 m (4 ft 6.9 in)
1.390 m (4 ft 6.7 in) (400N)
DimensionsL: 2.115 m (6 ft 11.3 in)
W: .730 m (2 ft 4.7 in)
H: 1.105 m (3 ft 7.5 in)
Seat height0.795 m (2 ft 7.3 in)
Weight167 kg (368 lb)
171 kg (377 lb) (400N)[2] (dry)
Fuel capacity14 L (3.1 imp gal; 3.7 US gal)
RelatedHonda CB250T
Honda CB400T
Honda CM400
Honda CB450T
Honda CB450SC
Honda CB450DX-K

Engine

The Super Dream was fitted with a four stroke, air-cooled, twin-cylinder engine. It had three valves per cylinder, two inlet and one exhaust, operated by a chain-driven overhead camshaft. Ignition was provided by capacitor discharge ignition (CDI).[8] It had a 360° crank layout similar to many traditional British parallel twins, but with two balance shafts to reduce unwanted vibrations. It used a six-speed transmission and chain final drive.[8] Fuelling was provided by twin Keihin carburettors.[9]

CB250N

The CB250N Super Dream was a 249 cc (15.2 cu in) motorbike. It was a popular model in the United Kingdom due to the licensing laws at the time allowing learners to ride any motorbike with a capacity under 250cc.[10][11] The CB250N was the most popular selling bike in the UK with over 17000 bikes sold in 1980 alone.[10] Its popularity in the United Kingdom waned along with many in the 250cc class when in 1983, the maximum size of learner machines was reduced to 125 cc (7.6 cu in).

During its production run it had several variations from 1978 to 1986. The various designations were, CB250N (1978–1979), CB250NA (1980), CB250NB/NDB Deluxe (1981) and CB250NDC (1982–1985)[12] and CB250NDD (1983–1986).

CB400N

The CB400N Super Dream was very similar to the 250N variant. However, it differed from the 250N with its larger engine capacity, twin front brake discs and a halogen front head light.[6] The instrumentation had different markings for the rev counter and speedometer to reflect the higher top speed and lower RPM redline.[12]

The CB400N had several revisions during its production run. The launch model CB400N (1979–1980), CB400NA (1980–1981), CB400NB (1981–1983), CB400NC (1982–1985)[12] and CB400ND (1983–1986).

References
  1. "Honda Owners Manual". Honda Motor Company. p. 139. Retrieved 7 September 2019.
  2. Honda CB250:CB400 Owners Manual. Honda Motor Company. p. 100.
  3. "Bike magazine". Bauer. June 1980: 39. Cite journal requires |journal= (help)
  4. "Bike magazine". Bauer. May 1979: 71. Cite journal requires |journal= (help)
  5. Honda CB250:CB400 Owners Manual. Honda Motor Company. p. 94.
  6. Haynes CB250N & CB400N Owners Workshop Manual. Haynes Publishing Group. 1990. p. 5.
  7. "Motorcycle International magazine". August 1988: 66. Cite journal requires |journal= (help)
  8. Haynes CB250N & CB400N Owners Workshop Manual. Haynes Publishing Group. 1990. p. 18.
  9. Haynes CB250N & CB400N Owners Workshop Manual. Haynes Publishing Group. 1990. p. 63.
  10. "What Bike magazine". February 1981: 66. Cite journal requires |journal= (help)
  11. "Motorcycle International magazine". August 1988: 67. Cite journal requires |journal= (help)
  12. "Classic Motorcycle Mechanics". Mortons Media Group. June 2013: 54. Cite journal requires |journal= (help)


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