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Honda Horizontal OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTS3

Item# 44258
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Honda Horizontal OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTS3

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Only $219.99
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  •  Air-cooled, 4-stroke, horizontal engine
  • Applications: String Trimmers, Earth Augers and other high-RPM applications
  • Automatic decompression for easy starting
  • Reliable and durable, with an overhead cam design that offers cooler, fuel-efficient operation
  • Cast iron cylinder sleeve that provides longer service life
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Product Summary

The Honda 25cc GX Series OHC mini commercial-grade engine is designed for the most demanding commercial applications. Expect this engine to be reliable and durable, with an overhead cam design that offers cooler, fuel-efficient operation and cast iron cylinder sleeve that provides longer service life. This engine is reliable, easy starting and quiet running. Great for use with construction equipment. Designed for high-RPM applications such as trimmers, mini-tillers and more.

What's Included
  •  (1) Engine

Features + Benefits

  •  Air-cooled, 4-stroke, horizontal engine
  • Applications: String Trimmers, Earth Augers and other high-RPM applications
  • Automatic decompression for easy starting
  • Reliable and durable, with an overhead cam design that offers cooler, fuel-efficient operation
  • Cast iron cylinder sleeve that provides longer service life
  • Reliable, starts easily and runs quietly
  • Great for use with construction equipment
  • Full 360° any-side-up operation
Key Specs
Item# 44258
Brand Honda Engines
Manufacturer's Warranty 2 years consumer use / 1 year commercial use
Ship Weight 15.0 lbs
Engine Displacement (cc) 25
Start Type Recoil
Application String trimmer, mini-tiller and other high-RPM applications
Engine Type GX series 4-stroke OHC
Net Power Output (HP) 1.0 (.72 kW) at 7,000 RPM
Net Torque (lbs./ft.) 0.74 (1.0 Nm) at 5,000 RPM
Shaft Output Horizontal
Crankshaft Horizontal
Shaft Diameter (in.) Clutch
Shaft Length (in.) Crank/piston assembly
Shaft Rotation (From PTO Shaft Side) Counterclockwise
PTO Height (in.) 3.5
Bearing Type Ball
Cylinders (qty.) 1
Cylinder Bore Cast iron
Bore x Stroke (in.) 1 3/8 x 1
Compression Ratio 8:1
Cooling System Forced air
Air Cleaner Type Semi-dry
Fuel Tank Yes
Fuel Type Gasoline
Fuel Tank Capacity (qt.) 0.61
Fuel Pump Accelerator pump in carburetor
Fuel Filter Yes
Oil Capacity (qt.) 0.084
Lubrication System Oil mist, crankshaft pressure-driven
Ignition System Transistorized magneto
Carburetor Diaphragm (overflow return)
Throttle Control Manual
Choke Control Manual
Max. RPM 7,000
Muffler Included Yes
Auto Compression Release Yes
Bolt Circle (in.) 2.6
Mounting Base L x W (in.) 2.3 x 2.3
Dimensions L x W x H (in.) 7.6 x 8.7 x 9.1
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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Item# 44258
Honda Horizontal OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTS3 The price is $219.99.
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Hide Similarities
Engine Displacement (cc)
25 35.8 118 49.4 118
Start Type
Recoil Recoil Recoil Recoil Recoil
Application String trimmer, mini-tiller and other high-RPM applications Earth auger, trimmer, Graco paint striper Pressure washer, compressor, log splitter, chipper/shredder Generator, pump, tiller, small construction equipment Cement mixer, pump
Engine Type GX series 4-stroke OHC GX series 4-stroke OHC GX series OHV commercial-duty GXH series OHV commercial-duty GX series OHV commercial-duty
Net Power Output (HP) 1.0 (.72 kW) at 7,000 RPM - 3.5 (2.6 kW) at 3,600 RPM 2.1 (1.6 kW) at 7,000 RPM 3.5 (2.6 kW) at 3,600 RPM
Net Torque (lbs./ft.) 0.74 (1.0 Nm) at 5,000 RPM - 5.4 (7.3 Nm) at 2,500 RPM 2.0 (2.7 Nm) at 4,500 RPM 5.4 (7.3 Nm) at 2,500 RPM
Shaft Output
Horizontal Horizontal Horizontal Horizontal Horizontal
Crankshaft Horizontal With clutch Q-type - H type
Shaft Diameter (in.) Clutch Clutch 3/4 5/8 3/4
Shaft Length (in.) Crank/piston assembly Crank/piston assembly 2 7/16 1 1/4 2 3/32
Shaft Keyway (in.)
- - 3/16 - 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) - - 5/16–24 1/4–28 -
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
Gear Reduction
- - - - H type 6:1
PTO Height (in.)
3.5 3.9 4 11/64 3 11/32 4 11/64
Bearing Type Ball Ball - - -
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Cast iron Cast iron Cast iron Cast iron Cast iron
Bore x Stroke (in.)
1 3/8 x 1 1 17/32 x 1 3/16 2.4 x 1.7 1.65 x 1.42 2.4 x 1.7
Compression Ratio
8:1 8:1 8.5:1 8.0:1 8.5:1
Cooling System
Forced air Air Air cooled Air cooled Air cooled
Air Cleaner Type
Semi-dry Semi-dry Dual element Semidry Dual element
Fuel Tank Yes Yes - - -
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
0.61 0.67 2.1 0.81 2.1
Fuel Pump Accelerator pump in carburetor Yes - - -
Fuel Filter Yes Yes - - -
Oil Capacity (qt.)
0.084 0.106 0.59 0.26 0.59
Lubrication System
Oil mist, crankshaft pressure-driven Crankcase pressure driven Forced splash Forced splash Forced splash
Low Oil Alert
- - Yes No Yes
Low Oil Shutdown
- - Yes - Yes
Ignition System
Transistorized magneto Transistorized magneto Electronic Electronic Electronic
Governor System
- - Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical
Carburetor
Diaphragm (overflow return) Diaphragm (overflow return) Float Float Float
Throttle Control
Manual Manual Remote (wire) Manual Remote (wire)
Choke Control
Manual Manual Manual Manual Manual
Max. RPM
7,000 7,000 3,600 7,600 3,600
Muffler Included
Yes Yes Yes, (standard, spark arrestor) Yes Yes, (standard)
Auto Compression Release
Yes Yes Yes Yes Yes
Bolt Circle (in.)
2.6 3.5 3 5/8 4 11/64 3 5/8
Mounting Base L x W (in.)
2.3 x 2.3 2.78 x 2.78 6 3/8 x 3 5/32 to 3 11/32 4 3/4 x 2 1/8 6 3/8 x 3 5/32 to 3 11/32
Dimensions L x W x H (in.)
7.6 x 8.7 x 9.1 8 x 9 1/5 x 9 2/5 12 x 13 3/8 x 12 1/2 8 7/8 x 10 13/16 x 13 12 x 13 3/8 x 12 1/2
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes