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| Engine | Four-stroke vertical twin |
| Displacement | 395 cc |
| Bore and stroke | 70.5x50.6 mm |
| Compression Ratio | 9.3:1 |
| Carburetor | Two 30mm CV Type |
| Ignition | CDI |
| Starter | Electric |
| Oil Capacity | 2.5 litres |
| Transmission | 5 speed Constant Mesh |
| Final Drive | Chain |
| Length | 83.1 in |
| Width | 33.7 in |
| Height | 45.5 |
| Wheelbase | 56.1 in |
| Seat Height | 29.5 in |
| Dry Weight | 377 lbs |
| Curb weight | 401 lbs |
| Fuel tank | 10.0 litres |
| Suspension-Front | Telescopic Fork |
| Suspension-Rear | Swing Arm |
| Brake-Front | Disc |
| Brake-Rear | Drum |
| Front tire | 3.50S18 |
| Rear tire | 4.60S16 |
| Vehicle Load | Front | Rear |
| Up to 200 lbs (90 Kg) | 28 (2.0) | 28 (2.0) |
| Up to 400 lbs (181 Kg) | 28 (2.0) | 36 (2.5) |
Note: 400 lbs or 181 Kg is the maximum vehicle load capacity for the 1981 CM400T
| Front suspension pressure: | 11 ±3 psi |
| 0.8 ±0.2 kg/cm² |
| Recommended Oil Viscosity | SAE 10W-40 |
| Temp above -10°C (15°F) | SAE 20W-40, 20W-50 |
| Temp above -20°C (-5°F) | SAE 10W-40 |
| Temp -20°C (-5°F) to 33°C (90°F) | SAE 10W-30 |
| Drain plug torque | 2.5-3.5 kg-m (18-25 ft-lb) |
| Oil filter bolt torque | 2.8-3.2 kg-m (20-23 ft-lb) |
| ND | NGK | |
| Standard | X24ES-U | D8EA |
| Cold Climate (Below 5°C/41°F) | X22ES-U | D7EA |
| Extended high speed driving | X27ES-U | D9EA |
| Spark plug gap | 0.6-0.7 mm (0.024-0.028 in) |
| Idle Speed | 1,200 ±100 rpm |
| Intake | 0.10 mm (0.004 in) |
| Exhaust | 0.14 mm (0.006 in) |
| Headlight (High/Low) | 50/35W |
| Tail/stoplight | SAE No. 1157 |
| Front turn signal/running light | SAE No. 1034 |
| Rear turn signal | SAE No. 1073 |
| Meter lights | SAE No. 57 |
| Neutral indicator light | SAE No. 57 |
| Turn signal light | SAE No. 57 |
| High beam indicator light | SAE No. 57 |
| Main | 15A |
| Head light/tail light | 7A |
