
The Honda EM400 generator uses a single-cylinder gasoline engine (55.4 cc; 3.38 cu.in.). The engine has a side-valve (L-head) design flywheel magneto ignition system. Cylinder bore and the piston stroke are 42.0 mm (1.65 in) and 40.0 mm (1.57 in), respectively. Compression ratio rating is 5.5:1.
The engine produced 1.1 HP at 3,600 rpm of maximum horsepower and 0.8 HP at 3,600 rpm of rated power.
General information
| Generator Specifications | ||
| Model | Honda EM400 | |
| Dimensions (L x W x H): | 355 x 265 x 310 mm (14.0 x 10.4 x 12.2 in) | |
| Dry weight | 17.5 kg (38.6 lbs) | |
| AC Rated voltage: | 115V | |
| AC Rated output: | 300 VA | |
| AC Maximum output: | 300 VA | |
| Rated frequency: | 64 Hz | |
| DC output: | 100 VA | |
| Fuel tank capacity | 2.0 L (0.53 US gal, 0.43 Imp gal) | |
| Engine | ||
| Displacement | 55.4 cm3 (3.38 cu-in) | |
| Bore x stroke | 42.0 x 40.0 mm (1.65 x 1.57 in) | |
| Max. horsepower | – | |
| Max. torque | – | |
| Carburetor | Horizontal type, butterfly valve | |
| Cooling system | Forced-air | |
| Ignition system | Transistorized magneto ignition | |
| Lubricating system | Splash | |
| Starting system | Recoil starter | |
| Stoping system | Ignition primary circuit ground | |
| Fuel used | Unleaded gasoline (octane number 86 or higher) | |
Maintenance data
| Oil system | |
| Oil type | Honda 4-stroke “SE” |
| Recommended oil | 10W-30 |
| Oil capacity | 0.3 L (0.32 US pt., 0.26 Imp.qt.) |
| Ignition system | |
| Spark plug | NGK: CM-6 |
| Spark plug gap | 0.4 mm (0.016 in) |
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