Honda CM450 information The larger capacity of the Honda CM450 resulted in 47bhp when launched in 1982. This was serious performance, gained mainly from the use of a three valve head, unique at that time. But where the CM400 HONDAMATIK model had flopped, the CM450 with more power, although still down on the manual change model, succeeded. Honda CM450 (US Market) 82-83 Parts & Accessories. Front Disc Size 180.1mm. Front-Pistons-per-caliper 1. Rear Drum Size 140.1. Brake fluid DOT-3. Fuel Capacity 3.5 GAL. Reserve Fuel Capacity.5 GAL. Spark Plugs NGK DR8ES-L. Bulb-Headlight 12v 50/35W.
Honda CM 400T
Make Model | Honda CM 400T |
Year | 1979 |
Engine | Four stroke, parallel twin, OHC, 3 valve per cylinder |
Capacity | 395 cc / 24.1 cu-in |
Bore x Stroke | 70.5 x 50.6 mm |
Cooling System | Air cooled |
Compression Ratio | 9.3:1 |
Induction | 2x 32mm Keihin carburetors |
Ignition | Capacitor discharge electronic ignition |
Starting | |
Max Power | |
Max Torque | |
Transmission | 5 Speed |
Final Drive | Chain |
Front Suspension | Telehydraulic forks |
Rear Suspension | Swingarm fork with adjustable telehydraulic shocks. |
Front Brakes | Single disc |
Rear Brakes | Drum |
Front Tyre | 3.50-18 |
Rear Tyre | 4.60-16 |
Dry Weight | 173 kg / 338 lbs |
Fuel Capacity | 9.5 Litres / 2.5 US gal |
1982 Honda 450

The Honda CM series was a street bike precursor to the Honda Rebel series of motorcycles produced from 1979-1981. These bikes had a 395cc parallel twin engine that was air-cooled. Features included electric start and electronic ignition.
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' alloy 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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General information | |
Category: | Naked bike |
Year: | 1982 |
Model: | Honda CM 450 Custom |
Engine and Transmission Specifications | |
Greenhouse gases: | 90.9 CO |
Fuel consumption: | 3.92 litres/100 km (25.5 km/l or 60.01 mpg) |
Transmission type,final drive: | Chain |
Cooling system: | Air |
Ignition: | CDI |
Fuel control: | OHC |
Fuel system: | Carburettor |
Valves per cylinder: | 2 |
Bore x stroke: | 75.0 x 50.6 mm (3.0 x 2.0 inches) |
Compression: | 9.1:1 |
1/4 mile (0.4 km): | 13.700 seconds |
Power: | 37.00 |
Engine type: | Twin, four-stroke |
Capacity: | 447.00 ccm (27.28 cubic inches) |
Brakes, suspension, Frame and wheels | |
Rear brakes: | Expanding brake (drum brake) |
Front brakes: | Single disc |
Rear tyre dimensions: | 4.60S16-4PR |
Front tyre dimensions: | 3.50S18-4PR |
Rear suspension: | Adjustable telehydraulic shocks |
Trail: | 114 mm (4.5 inches) |
Rake (fork angle): | 59.0° |
Physical measures and capacities | |
Reserve fuel capacity: | 2.00 litres (0.53 gallons) |
Fuel capacity: | 13.00 litres (3.43 gallons) |
Wheelbase: | 1,450 mm (57.1 inches) |
Overall width: | 855 mm (33.7 inches) |
Overall length: | 2,145 mm (84.4 inches) |
Overall height: | 1,180 mm (46.5 inches) |
Power/weight ratio: | 0.2126 HP/kg |
Dry weight: | 174.0 kg (383.6 pounds) |
Other specs | |
Starter: | Electric |
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