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Honda Horizontal OHV Engine — 389cc, GX Series, 1in. x 3 31/64in. Shaft, Model# GX390UT2QAA2
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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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Manufacturer's Warranty: 3 year limited warranty

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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

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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

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Item#6066
Ship Weight85.0 lbs
Engine Displacement (cc)389
Start TypeRecoil
ApplicationPressure washer, compressor
Engine TypeGX series OHV commercial-duty
Torque (ft./lbs.)18.50 at 2,500 RPM
Shaft OutputHorizontal
CrankshaftQ-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 BoreCast iron
Bore x Stroke (in.)3.5 x 2.5
Compression Ratio8.0:1
Cooling SystemAir cooled
Air Cleaner TypeDual element
Fuel TankStandard (White)
Fuel TypeGasoline
Fuel Tank Capacity (qt.)6.4
Fuel FilterFuel tank filler neck strainer
Oil Capacity (qt.)1.16
Lubrication SystemForced splash
Low Oil AlertYes
Low Oil ShutdownYes
Ignition SystemElectronic
Governor SystemCentrifugal mechanical
CarburetorFloat, external vent
Throttle ControlRemote (wire)
Choke ControlManual
Max. RPM3,600
Muffler IncludedSilent
Auto Compression ReleaseYes
Bolt Circle (in.)5, 6 1/2
Mounting Base L x W (in.)7 11/16 x 3 25/64 to 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

Additional Information

Dimensions

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Product Question + Answer

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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
3 year limited warranty

Protect your purchase beyond the manufacturer's warranty
with Service Protection Plus!

DESCRIPTION (Click More Info for details) 1 Year Extension 2 Year Extension
Repair Plan
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Hide Similarities
Engine Displacement (cc)
389 389 270 389 389
Start Type
Recoil Recoil Electric w/recoil backup Recoil Electric w/recoil backup
Application Chipper, shredder, log splitter, compressor Pressure washer, compressor Pressure washer, compressor, log splitter Pressure washer, compressor, log splitter 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
Rated Power (HP)
9 1/2 - 8 11 13
Torque (ft./lbs.)
16.30 at 2,500 RPM 18.50 at 2,500 RPM 13.10 at 2,500 RPM 18.50 at 2,500 RPM 18.50 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
Shaft End Tapped (Diameter (in.)/Threads per inch) 3/8–24 3/8–24 7/16–20 - 3/8–24
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
PTO Height (in.)
5 1/4 5 1/4 5 1/4 5 1/4 5 1/4
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Cast iron Cast iron Cast iron Cast iron Cast iron
Bore x Stroke (in.)
3.2 x 2.5 3.5 x 2.5 3.0 x 2.3 3.5 x 2.5 3.5 x 2.5
Compression Ratio
8.0:1 8.0:1 8.2:1 8.0:1 8.0:1
Cooling System
Air cooled Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Dual element Dual element Dual element Cyclone Dual element
Fuel Tank Standard (White) Standard (White) - Standard (White) Standard (White)
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
6.4 6.4 5.6 6.4 6.4
Fuel Filter
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, inner vent Float, external vent
Throttle Control
Manual Remote (wire) Remote (wire) Remote (wire) Remote (wire)
Choke Control
Manual Manual Manual Manual Manual
Max. RPM
3,600 3,600 3,600 3,600 3,600
Charging System Amps - - - - 10
Muffler Included
Standard, exhaust pipe protector, deflector Silent - Silent Silent, exhaust pipe protector, deflector
Auto Compression Release
Yes Yes - Yes Yes
Bolt Circle (in.)
5, 6 1/2 5, 6 1/2 5, 6 1/2 5, 6 1/2 5, 6 1/2
Mounting Base L x W (in.)
7 11/16 x 3 25/64 to 4 1/16 7 11/16 x 3 25/64 to 4 1/16 7 11/16 x 3 3/16–3 11/16 7 11/16 x 3 25/64 to 4 1/16 7 11/16 x 3 25/64 to 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 15 7/8 x 17 11/16 x 17 3/8
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes