The main difference is that the GXV390UT1DEX3 has a slightly longer shaft (3.13″ vs. 3.11″) and includes a 3‑Amp charging coil.
Honda Engines, HONDA ENGINE VERT 389CC E/S, Engine Displacement 389 cc, Engine Type GXV Series OHV Commercial-duty, Shaft Diameter 1 in, Model# GXV390UT1DEXT

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- Model# GXV390UT1DET; 389cc, GXV Series engine with 1in. dia. x 3.11in.L vertical shaft
- Overhead valve design for cooler, fuel-efficient operation
- Electronic ignition system
- 10in. mounting bolt circle
- Cast iron cylinder sleeve provides longer service life
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Description
Key Specs
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Product Summary
What's Included
- (1) Engine
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Features + Benefits
- Model# GXV390UT1DET; 389cc, GXV Series engine with 1in. dia. x 3.11in.L vertical shaft
- Overhead valve design for cooler, fuel-efficient operation
- Electronic ignition system
- 10in. mounting bolt circle
- Cast iron cylinder sleeve provides longer service life
- Common applications include commercial turf equipment, lawn tractors and riding mowers
- Vertical-shaft engine provides easy-maintenance
- Not for sale in CA
Key Specs
| Attribute | Specification |
|---|---|
item# | 45685 |
Brand | Honda Engines |
Manufacturer's Warranty | 3 year limited warranty |
Ship Weight | 90.0 LB |
Engine Displacement | 389 cc |
Engine Type | GXV Series OHV Commercial-duty |
Shaft Diameter | 1 in |
Shaft Length | 3.11 in |
Fuel Type | Gasoline |
Start Type | Electric and Recoil |
Shaft Keyway | 0.25 in |
Net Torque | 17.8 ft-lbs. |
Crankshaft | D Type |
Cylinders (qty.) | 1 |
Cylinder Bore | Cast Iron |
Net Power Output | 10.2 HP |
Compression Ratio | 7.7:1 |
Fuel Tank | Yes |
Fuel Tank Capacity | 2.2 qt |
Oil Capacity | 1.2 qt |
Low Oil Shutdown | No |
| Attribute | Specification |
|---|---|
Low Oil Alert | No |
Max. RPM | 3,600 |
Shaft Rotation (From PTO Shaft Side) | Counter Clockwise |
Governor System | Centrifugal Mechanical |
Ignition System | Electronic |
Carburetor | Float |
Lubrication System | Pressure/splash |
Bearing Type | Ball |
Auto Compression Release | Yes |
Cooling System | Air |
Bore | 3.2 in |
Stroke | 2.5 in |
Air Cleaner Type | Dual Element |
Choke Control | Remote |
Throttle Control | Remote |
Fuel Filter | Yes |
Charging System Amps | 3 |
Muffler Included | Yes |
Bolt Circle | 10 in |
Product Weight | lb |
Dimensions L x W x H (in.) | 17.0 x 15.0 x 15.87 in |
Reviews
Questions & Answers
Questions
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· 8 months ago
What is the difference between gxv390UT1DEXT and the gxv390UT1DEX3
1 answer-
ProductExpert10· 8 months ago
Helpful?
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· a year ago
Does this engine have the Electric throttle control under the gas tank?
1 answer-
ProductExpert5· a year ago
The electric throttle control is located towards the base of the gas tank, along the backside of the engine.
Helpful?
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· 2 years ago
Is the center of the crank shaft threaded?
1 answer-
ProductExpert11· 2 years ago
The shaft will have a 7/16-20UNF-2BTAP tapped end.
Helpful?
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· 4 years ago
does this engine have a heavy duty flywheel
1 answer-
ProductExpert31· 4 years ago
This engine does not have a heavy duty flywheel.
Helpful?
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· 7 years ago
what is the rated horsepower on this engine
all these Honda engines show ccs but I don't see HP ratings?
1 answer-
ProductExpert7· 7 years ago
The HP output of this engine is 10.2.
Helpful?
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Warranty
Manufacturer's Warranty
3 year limited warranty
Extend Your Warranty Coverage with a Northern Protection Plan (NPP)
Repair Plan — 1 Year
A Northern Protection Plan is available after adding the product to your shopping cart.
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Specifications
389 cc
724 cc
570 cc
163 cc
GXV Series OHV Commercial-duty
Professional Series OHV
Vanguard Twin
OHV
1 in
1-1/8 in
1 in
7/8 in
3.11 in
4.29 in
3.18 in
3.15 in
Gasoline
Gasoline
Gasoline
Gasoline
Electric and Recoil
Electric
Recoil
Recoil
0.25 in
0.25 in
-
0.18 in
17.8 ft-lbs.
-
-
-
D Type
Vertical
Vertical
Vertical
1
2
2
1
Cast Iron
Cast Iron
Cast Iron
Aluminum
10.2 HP
25 HP
18 HP
-
7.7:1
-
-
-
Yes
No
No
Yes
2.2 qt
-
-
1.09 qt
1.2 qt
2 qt
1.5 qt
0.5 qt
No
No
No
No
No
No
No
No
3,600
3,400
3,600
3,100
Counter Clockwise
Counter Clockwise
Counter Clockwise
Counter Clockwise
Centrifugal Mechanical
Mechanical
Mechanical
Mechanical
Electronic
Electronic
Electronic
Magnetron
Float
Yes
Float
Bowl Type
Pressure/splash
Full Pressure
Full Pressure
Splash
Ball
Ball
-
Plain
Yes
Yes
Yes
No
Air
Air
Air
Air
3.2 in
3.12 in
2.83 in
2.69 in
2.5 in
2.89 in
2.76 in
1.75 in
Dual Element
Single Element
Dual Element
Single Element
Remote
Automatic
-
-
Remote
Remote
-
-
Yes
Yes
Yes
No
3
16
9
-
Yes
No
No
Yes
10 in
-
-
-
lb
87.0000 lb
87.0000 lb
23.0000 lb
17.0 x 15.0 x 15.87 in
16.0 x 19.0 x 18.0 in
22.25 x 19.62 x 19.62 in
13.4 x 10.25 x 9.95 in
-
No
No
No
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