Quality and Performance Come Standard

The GX390 offers all of the power, comfort, and efficiency you’ve come to expect from Honda - along with several new features to further enhance your experience. It’s no wonder why the GX Series is the go-to when performance counts. Experience loads of power, impressive durability and exceptional fuel consumption with the GX390 - a great engine choice for water pumps, pressure washers, small vehicles and more.

Common Applications

• Agricultural equipment
• Commercial lawn and garden equipment
• Construction/industrial equipment
• Forestry equipment
• Generators
• Pressure washers
• Small vehicles
• Tillers/cultivators
• Water pumps

FEATURES

Fuel-Efficient, High-Output Operation

• Variable timing digital CDI ignition
• Increased compression ratio
• Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency
• OHV design for increased efficiency and optimal power transfer.

Smooth Performance

• Precision-engineered components result in lower vibration
• Ball bearing supported crankshaft for greater stability
• Heavy duty balancer shaft
• Improved piston design.

Exceptionally Quiet

• Large capacity, multi-chamber exhaust system
• Improved camshaft and muffler reduce overall engine noise by up to 5 dB
• Forged steel crankshaft and rigid crankcase
• Helical cut gears
• Sophisticated air intake system.

Proven Reliability

• Oil alert
• Cast iron cylinder sleeve
• High-quality materials, fit, and finish
• Dual element air cleaner
• Fuel Valve
• 3-Year Limited Warranty.

Easy to Use and Maintain

• Simple throttle control
• Large fuel tanks
• Large automotive-type fuel cap
• Dual oil drains and fill
• Easy, convenient, heavy duty control box
• Easily accessible spark plug.

Easy Starting

• Heavy-duty recoil starter
• Automatic mechanical decompression system
• Variable ignition timing.

Emissions Compliant

• CARB and EPA certified
• No catalyst necessary.

Available Options

• Low profile versions
• Gear reduction options
• Electric start
• Spark arrester available
• Charge and lamp coils with multiple output options available
• Cyclone Air Cleaner available

Specs

• Engine Type - Air-cooled 4-stroke OHV
• Bore x Stroke - 88 mm x 64 mm
• Displacement - 389 cm3
• Net Power Output* - 11.7 HP (8.7 kW) @ 3,600 rpm
• Net Torque - 19.5 lb-ft (26.4 Nm) @ 2,500 rpm
• PTO Shaft Rotation - Counterclockwise (from PTO shaft side)
• Compression Ratio - 8.5:1
• Fuel Tank Capacity - 6.1 litres (6.4 U.S. qts)
• Lamp/Charge coil options - 25W, 50W / 1A, 3A, 10A, 18A
• Carburetor - Butterfly Float Type
• Ignition System - Digital CDI with variable ignition timing
• Starting System - Recoil/electric
• Lubrication System - Splash
• Governor System - Centrifugal mass type
• Air Cleaner - Dual element
• Oil Capacity - 1.1 litres (1.16 U.S. qts)
• Fuel - Unleaded 86 octane or higher
• Dry Weight - 31.5 kg (69 lbs)