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Honda Vertical OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTT3

Item# 44259
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Honda Vertical OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTT3

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Was $219.99
Sale $199.99

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  •  Air-cooled, 4-stroke, vertical 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, vertical 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 260° any-side-up operation
Key Specs
Item# 44259
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
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 Vertical
Shaft Diameter (in.) Clutch
Shaft Length (in.) Crank/piston assembly
Shaft Rotation (From PTO Shaft Side) Counterclockwise
PTO Height (in.) 3.4
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 3/5 x 8 7/10 x 9 1/10
EPA/CARB Approval (California Air Resource Board) Yes

Customer Reviews

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

Mon - Fri 7:00 AM - 6:00 PM (Central)
Sat 7:00 AM - 3:00 PM (Central)

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Honda Vertical OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTT3 The price is $199.99.
Honda Vertical OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTT3
5 / 5 (1)
Item# 44259
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Was $219.99
Sale $199.99
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4.3 / 5 (9)
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Engine Displacement (cc)
25 160 187 187 163
Start Type
Recoil Recoil Recoil Recoil Recoil
Application String trimmer, mini-tiller Lawn mower, chipper/vac, log splitter, pressure washer Pressure washer, tiller, log splitter, walk-behind trimmer Billy Goat lawn vac, commercial mower Walk-behind mower
Engine Type GX series 4-stroke OHC GCV series OHV commercial-duty GCV series OHC consumer/commercial GSV series OHC GXV series OHV commercial-duty
Net Power Output (HP) 1.0 (.72 kW) at 7,000 RPM 4.4 (3.3 kW) at 3,600 RPM 5.1 (3.8 kW) at 3,600 RPM 5.1 (3.8 kW) at 3,600 RPM 4.3 (3.2 kW) at 3,600 RPM
Net Torque (lbs./ft.) 0.74 (1.0 Nm) at 5,000 RPM 6.9 (9.4 Nm) at 2,500 RPM 8.3 (11.3 Nm) at 2,500 RPM 8.3 (11.3 Nm) at 2,500 RPM 7.1 (9.6 Nm) at 2,500 RPM
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft - N3 type N5 type vertical N1 type -
Shaft Diameter (in.) Clutch 63/64 (25mm) 7/8 7/8 7/8
Shaft Length (in.) Crank/piston assembly 3 5/32 1 15/16 (49mm) 3 5/32 3 3/16
Shaft Keyway (in.) - - 3/16 3/16 -
Shaft End Tapped (Diameter (in.)/Threads per inch) - - - 3/8–24 3/8–24
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
PTO Height (in.) 3.4 - - - -
Bearing Type Ball - Oil seal Ball -
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Cast iron Aluminum alloy Aluminum alloy Cast iron Cast iron
Bore x Stroke (in.)
1 3/8 x 1 2.5 x 2.0 2.7 x 2 2.7 x 2.0 2.7 x 1.8
Compression Ratio
8:1 8.5:1 8.5:1 8.5:1 8.0:1
Cooling System
Forced air Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Semi-dry Dry (paper) type Dry (paper) Dual element Dual element
Fuel Tank Yes Yes Yes Yes Yes
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
0.61 0.98 0.98 0.98 1.9
Fuel Pump Accelerator pump in carburetor - - Yes -
Fuel Filter Yes - Yes Yes -
Oil Capacity (qt.)
0.084 0.58 0.58 0.58 0.69
Lubrication System
Oil mist, crankshaft pressure-driven Forced splash Forced splash Forced splash Forced splash
Low Oil Alert - - No - -
Low Oil Shutdown - - No - -
Ignition System
Transistorized magneto Electronic Electronic Electronic Electronic
Governor System
- Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical
Carburetor
Diaphragm (overflow return) Float Horizontal butterfly valve Horizontal butterfly valve Float
Throttle Control
Manual - Fixed Remote Manual
Choke Control
Manual - Manual Remote (wire) Remote (wire)
Max. RPM
7,000 3,600 3,600 3,600 3,600
Muffler Included
Yes Yes Yes Yes Yes
Flywheel Brake
- Yes No Yes Yes
Auto Compression Release
Yes - Yes Yes Yes
Bolt Circle (in.)
2.6 8 1/2 8 1/2 8 8
Mounting Base L x W (in.) 2.3 x 2.3 - - - -
Dimensions L x W x H (in.)
7 3/5 x 8 7/10 x 9 1/10 14 3/8 x 13 x 13 13/16 14 3/8 x 13 x 13 13/16 14 3/5 x 13 1/2 x 13 4/5 16 5/16 x 14 1/8 x 13 7/8
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes