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Honda Horizontal OHV Engine — 389cc, GX Series, 1in. x 3 31/64in. Shaft, Model# GX390UT2QAA2

Item# 6066
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Honda Horizontal OHV Engine — 389cc, GX Series, 1in. x 3 31/64in. Shaft, Model# GX390UT2QAA2

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Only $689.99
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  • Air-cooled 4-stroke horizontal OHV engine for increased efficiency and optimal power transfer
  • Automatic decompression and heavy-duty recoil starter for easy starting
  • Heavy-duty ball bearing supported crankshaft for greater stability
  • Large double walled heavy-duty tank with in tank fuel strainer
  •  Large, easy to fill automotive-style fuel cap
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Product Summary

The Honda 389cc GX Series OHV commercial-grade engine is designed for the most demanding commercial applications. It has set an industry standard for reliability and durability. Overhead Valve design offers cooler, fuel-efficient operation and cast iron cylinder sleeve provides longer service life. The GX is reliable, easy starting and quiet running. Meets EPA and CARB emission levels standards. This legendary engine has earned the reputation as the preferred engine for construction equipment. Common applications include pressure washers, compressors, log splitters and chipper/shredders.

What's Included
  • (1) Engine, Model# GX390UT2QAA2

Features + Benefits

Features for Honda Horizontal OHV Engine — 389cc, GX Series, 1in. x 3 31/64in. Shaft, Model# GX390UT2QAA2
  • Air-cooled 4-stroke horizontal OHV engine for increased efficiency and optimal power transfer
  • Automatic decompression and heavy-duty recoil starter for easy starting
  • Heavy-duty ball bearing supported crankshaft for greater stability
  • Large double walled heavy-duty tank with in tank fuel strainer
  •  Large, easy to fill automotive-style fuel cap
  •  Auto idle/throttle control for extended engine life, improved fuel economy and reduced engine noise
  •  Precision camshaft for better fuel economy with precise valve timing and optimal valve overlap
  •  Low noise level thanks to a large capacity, multi-chambered exhaust system
  •  Improved camshaft and muffler reduce engine noise by up to 5dB
  • Oil Alert protects engine
  •  Cast iron cylinder
  •  Dual element air filter
  •  Easy to use throttle control
  • 50-state compliant engine
  •  Dual oil drains and fills for quick oil changes
  •  Easily accessible spark plug
Key Specs
Item# 6066
Brand Honda Engines
Manufacturer's Warranty 3 year limited warranty
Ship Weight 85.0 lbs
Engine Displacement (cc) 389
Start Type Recoil
Application Pressure washer, compressor
Engine Type GX series OHV commercial-duty
Net Power Output (HP) 11.7 (8.7 kW) at 3,600 RPM
Net Torque (lbs./ft.) 19.5 (26.4 Nm) at 2,500 RPM
Shaft Output Horizontal
Crankshaft Q-type
Shaft Diameter (in.) 1
Shaft Length (in.) 3 31/64
Shaft Keyway (in.) 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8–24
Shaft Rotation (From PTO Shaft Side) Counterclockwise
PTO Height (in.) 5 1/4
Cylinders (qty.) 1
Cylinder Bore Cast iron
Bore x Stroke (in.) 3.5 x 2.5
Compression Ratio 8.2:1
Cooling System Air cooled
Air Cleaner Type Dual element
Fuel Tank Standard (White)
Fuel Type Gasoline
Fuel Tank Capacity (qt.) 6.4
Fuel Filter Fuel tank filler neck strainer
Oil Capacity (qt.) 1.16
Lubrication System Forced splash
Low Oil Alert Yes
Low Oil Shutdown Yes
Ignition System Electronic
Governor System Centrifugal mechanical
Carburetor Float, external vent
Throttle Control Remote (wire)
Choke Control Manual
Max. RPM 3,600
Muffler Included Silent
Auto Compression Release Yes
Bolt Circle (in.) 5, 6 1/2
Mounting Base L x W (in.) 7 11/16 x 3 25/64–4 1/16
Dimensions L x W x H (in.) 15 7/8 x 17 11/16 x 17 3/8
EPA/CARB Approval (California Air Resource Board) Yes

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Replacement Parts
Call To Order: 1-800-657-0516

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Sat 7:00 AM - 3:00 PM (Central)

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Hide Similarities
Engine Displacement (cc)
270 389 270 389 389
Start Type
Recoil Recoil Electric w/recoil backup Electric w/recoil backup Electric w/recoil backup
Application Chipper, shredder, log splitter, compressor Pressure washer, compressor Pressure washer, compressor, log splitter Pressure washer, compressor Pressure washer, compressor
Engine Type GX series OHV commercial-duty GX series OHV commercial-duty GX series OHV commercial-duty GX series OHV commercial-duty GX series OHV commercial-duty
Net Power Output (HP) 8.5 (6.3 kW) at 3,600 RPM 11.7 (8.7 kW) at 3,600 RPM 8.5 (6.3 kW) at 3,600 RPM 11.7 (8.7 kW) at 3,600 RPM 11.7 (8.7 kW) at 3,600 RPM
Net Torque (lbs./ft.) 14.1 (19.1 Nm) at 2,500 RPM 19.5 (26.4 Nm) at 2,500 RPM 14.1 (19.1 Nm) at 2,500 RPM 19.5 (26.4 Nm) at 2,500 RPM 19.5 (26.4 Nm) at 2,500 RPM
Shaft Output
Horizontal Horizontal Horizontal Horizontal Horizontal
Crankshaft Q-type Q-type Q-type Q-type Q-type
Shaft Diameter (in.) 1 1 1 1 1
Shaft Length (in.) 3 31/64 3 31/64 3 31/64 3 31/64 3 31/64
Shaft Keyway (in.)
1/4 1/4 1/4 1/4 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) 7/16-20 3/8–24 7/16–20 3/8–24 3/8–24
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise CCW Counterclockwise
PTO Height (in.)
5 1/4 5 1/4 5 1/4 5 1/4 5 1/4
Bearing Type Ball bearing - - - -
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Cast iron Cast iron Cast iron Cast iron Cast iron
Bore x Stroke (in.)
3 x 2.3 3.5 x 2.5 3.0 x 2.3 3.5 x 2.5 3.5 x 2.5
Compression Ratio
8.5:1 8.2:1 8.5:1 8.2:1 8.2:1
Cooling System
Air cooled Air cooled Air cooled Air Air cooled
Air Cleaner Type
Dual element Dual element Dual element Dual element Dual element
Fuel Tank Yes Standard (White) - Standard Standard (White)
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
5.6 6.4 5.6 6.4 6.4
Fuel Filter
Yes Fuel tank filler neck strainer Fuel tank filler neck strainer Fuel tank filler neck strainer Fuel tank filler neck strainer
Oil Capacity (qt.)
1.16 1.16 1.16 1.16 1.16
Lubrication System
Forced splash Forced splash Forced splash Forced splash Forced splash
Low Oil Alert
Yes Yes Yes Yes Yes
Low Oil Shutdown
Yes Yes - Yes Yes
Ignition System
Electronic Electronic Electronic Electronic Electronic
Governor System
Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical
Carburetor
Float, external vent Float, external vent Float, external vent Float, external vent Float, external vent
Throttle Control
Manual Remote (wire) Remote (wire) Remote, wired Remote (wire)
Choke Control
Manual Manual Manual Manual Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps - - - 3 10
Muffler Included
Yes Silent - - Silent, exhaust pipe protector, deflector
Auto Compression Release
Yes Yes - - Yes
Bolt Circle (in.)
5, 6 1/2 5, 6 1/2 5, 6 1/2 5, 6.5 5, 6 1/2
Mounting Base L x W (in.)
7 11/16 x 3 3/16–3 11/16 7 11/16 x 3 25/64–4 1/16 7 11/16 x 3 3/16–3 11/16 7.7 x 3.39–4.06 7 11/16 x 3 25/64–4 1/16
Dimensions L x W x H (in.)
15 x 16 7/8 x 16 1/8 15 7/8 x 17 11/16 x 17 3/8 15 x 16 7/8 x 16 1/8 - 15 7/8 x 17 11/16 x 17 3/8
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes