Honda EM300 portable generator : review, specs, engine service data

The Honda EM300 is AC/DC portable generator with 360 VA of maximum power and 300 0VA of rated power and 50 Hz/60Hz of rated frequency. The EM300 generator is available with 115/230 V rated voltage (A-type), 220V only (E type) or 240 V only (U types).

The direct current terminals can be used for charging 12-volt automotive type batteries only.

The Honda EM300 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.

General information

Generator Specifications
Model	Honda EM300
Dimensions (L x W x H):	355 x 260 x 310 mm (14.0 x 10.2 x 12.2 in)
Dry weight	18.0 kg (39.7 lbs)
Type A
AC Rated voltage:	115V
AC Rated output:	250 VA (2.2 A)	300 VA (2.6 A)
AC Maximum output:	300 VA	360 VA
Rated frequency:	50 Hz	60 Hz
DC output:	12V up to 7A
Type E
AC Rated voltage:	220V
AC Rated output:	250 VA (1.2 A)	300 VA (1.4 A)
AC Maximum output:	300 VA	360 VA
Rated frequency:	50 Hz	60 Hz
DC output:	12V up to 7A
Type U
AC Rated voltage:	240V
AC Rated output:	250 VA (1.1 A)
AC Maximum output:	300 VA
Rated frequency:	50 Hz
DC output:	12V up to 7A
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)

Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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We try to use official documentation and verify the published data, but errors may occur. In addition, specifications of machinery and equipment may vary depending on markets and modifications. We do not recommend the use of this data for spare parts or repairs. Use official service manuals or parts catalogs for your product.

Honda EM300

General information

Maintenance data

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