• Use 4-stroke motor oil that meets or exceeds the requirements for API service classification SJ or later (or equivalent). Always check the API service label on the oil container to be sure it includes the letters SJ or later (or equivalent). Oil is a major factor affecting performance and service life. Use 4-stroke automotive detergent oil.
• SERVICE INFORMATION The service and repair information contained in this manual is intended for use by qualified, professional technicians. Attempting service or repairs without the proper training, tools, and equipment could cause injury to you and/or others. It could also damage this Honda product or create an unsafe condition.
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• Honda Gx390 Service Manual Download
• Honda Gx 390 Air Filter
• Honda Gx 390 Engine Specs
• Honda Gx390 Service Manual Download

Shop manuals. Search for the shop manuals in the language of your choice. The shop manuals have been limited to the items which are most relevant for standard service jobs. The complete version is available through the spare parts link.

ENGLISH

REFUELING

Recommended Fuel

Recommended Oil

ENGINE OIL

AMBIENT TEMPERATURE

M

M

A

A

X

X

I

I

M

M

U

U

M

M

F

F

U

U

E

E

Bmw e39 service manual free download. L

L

L

L

E

E

V

V

E

E

L

L

F

F

U

U

E

E

L

L

F

Honda Gx390 Service Manual Download

F

I

I

L

L

L

L

E

E

R

R

Honda Gx 390 Air Filter

C

C

A

A

P

P

8

Unleaded gasoline

Pump octane rating 86 or higher
Research octane rating 91 or higher
Pump octane rating 86 or higher

U.S.
Except U.S.

This engine is certified to operate on unleaded gasoline with a
pump octane rating of 86 or higher (a research octane rating of 91
or higher).
Refuel in a well-ventilated area with the engine stopped. If the
engine has been running, allow it to cool first. Never refuel the
engine inside a building where gasoline fumes may reach flames
or sparks.
You may use regular unleaded gasoline containing no more than
10% ethanol (E10) or 5% methanol by volume. In addition,
methanol must contain cosolvents and corrosion inhibitors. Use of
fuels with content of ethanol or methanol greater than shown
above may cause starting and/or performance problems. It may
also damage metal, rubber, and plastic parts of the fuel system.
Engine damage or performance problems that result from using a
fuel with percentages of ethanol or methanol greater than shown
above are not covered under warranty.

Add fuel to the bottom of the fuel level limit of the fuel tank. Do
not overfill. Wipe up spilled fuel before starting the engine.

SAE 10W-30 is recommended for general use. Other viscosities
shown in the chart may be used when the average temperature in
your area is within the indicated range.

Use 4-stroke motor oil that meets or exceeds the requirements for
API service classification SJ or later (or equivalent). Always check
the API service label on the oil container to be sure it includes the
letters SJ or later (or equivalent).

Oil is a major factor affecting performance and service life. Use
4-stroke automotive detergent oil.

Spilled fuel is not only a fire hazard, it causes environmental
damage. Wipe up spills immediately.

Keep gasoline away from appliance pilot lights, barbecues,
electric appliances, power tools, etc.

Refuel carefully to avoid spilling fuel. Do not fill the fuel tank
completely. It may be necessary to lower the fuel level
depending on operating conditions. After refueling, tighten the
fuel filler cap securely.

With the engine stopped and on a level surface, remove the fuel
filler cap and check the fuel level. Refill the tank if the fuel level
is low.

Never use stale or contaminated gasoline or oil/gasoline mixture.
Avoid getting dirt or water in the fuel tank.

Fuel can damage paint and some types of plastic. Be careful not to
spill fuel when filling your fuel tank. Damage caused by spilled
fuel is not covered under the Distributor’s Limited Warranty.

Wipe up spills immediately.

Refuel only outdoors.

Stop engine and keep heat, sparks, and flame away.

Gasoline is highly flammable and explosive, and you
can be burned or seriously injured when refueling.

If your equipment will be used on an infrequent or intermittent
basis, please refer to the fuel section of the HELPFUL TIPS AND
SUGGESTIONS chapter (see page

) for additional information

regarding fuel deterioration.

1.

2.

3.

07/10/25 14:40:00 32Z5F600_008

Honda Gx 390 Engine Specs

Honda Gx390 Service Manual Download