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Honda CM400

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Title: Honda CM400  
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Subject: Honda CB400 (twin), Honda CB250N/CB400N, Honda CB900F, Honda, Hondamatic
Collection: Honda Motorcycles
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Honda CM400

Honda CM400T
1979 Honda CM400T
Manufacturer Honda Motor Company
Production 1978–1982
Successor Honda CM450
Class Standard
Engine 395 cc (24.1 cu in) OHC air-cooled 3 valves/cyl 180° parallel twin,
Bore / stroke 70.7 mm × 50.6 mm (2.78 in × 1.99 in)
Compression ratio 9.3:1
Ignition type capacitor discharge electronic ignition
Transmission 5-speed manual
Suspension Front: telescopic
Rear: swingarm
Brakes Front: drum (base model)
Front: disc (T model, C model)
Rear: drum
Tires 3.50 in × 18 in (89 mm × 457 mm) (front) 4.60 in × 16 in (117 mm × 406 mm) (rear)

The Honda CM400 was a street bike produced by the Honda Motor Company from 1979 to 1982, part of a series of motorcycles with the prefix 'CM' using various engine capacities. It was a precursor to the Honda Rebel series of motorcycles. The bike had a 395 cc (24.1 cu in) air cooled parallel twin cylinder engine. It was equipped with electric start and electronic ignition. Models included the CM400A (Automatic), CM400C (Custom), CM400E (Economy) and CM400T (Tach).

The Honda CM series all generally resembled the older-style flat-seat bikes from the 60s and 70s, with the exception of a slightly raised passenger area seat and small plastic fairings for the battery and electrical. These are "standard" style motorcycles but do have some elements of the cruiser (stepped seat, increased fork angle, extra chrome).

The CM400 series includes only a speedometer and three indicator lights (neutral, oil pressure, high beam) with a tachometer for the C and T models. The E (economy) model had wire wheels and drum brakes, while the others had Comstar wheels and a front disk/rear drum braking setup. While not particularly powerful, the CM400's handling makes it one of the great starter bikes.

Many engine components are common with the Honda CB400T models from the same year. The parallel twin engine has three valves per cylinder (two intake, one exhaust) and a five-speed manual or two-speed automatic transmission. In 1982, the CM engine was bored out to a 447 cc engine with six gears, and the series was renamed CM450.


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