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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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Only $219.99
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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

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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 $219.99.
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Hide Similarities
Engine Displacement (cc)
25 187 187 389 337
Start Type
Recoil Recoil Recoil Recoil Electric w/recoil backup
Application String trimmer, mini-tiller Pressure washer, tiller, log splitter, walk-behind trimmer Billy Goat lawn vac, commercial mower Commercial turf equipment, lawn tractor, riding mower Commerical turf equipment, lawn tractor, riding mower
Engine Type GX series 4-stroke OHC GCV series OHC consumer/commercial GSV series OHC GXV series OHV commercial-duty GXV series OHV commercial-duty
Net Power Output (HP) 1.0 (.72 kW) at 7,000 RPM 5.1 (3.8 kW) at 3,600 RPM 5.1 (3.8 kW) at 3,600 RPM 10.2 (7.6 kW) at 3,600 RPM 8.9 (6.6 kW) at 3,600 RPM
Net Torque (lbs./ft.) 0.74 (1.0 Nm) at 5,000 RPM 8.3 (11.3 Nm) at 2,500 RPM 8.3 (11.3 Nm) at 2,500 RPM 17.8 (24.2 Nm) at 2,500 RPM 15.9 (21.6 Nm) at 2,500 RPM
Shaft Output
Vertical Vertical Vertical Vertical Vertical
Crankshaft - N5 type vertical N1 type D type vertical -
Shaft Diameter (in.) Clutch 7/8 7/8 1 1
Shaft Length (in.) Crank/piston assembly 1 15/16 (49mm) 3 5/32 3.11 3.11
Shaft Keyway (in.)
- 3/16 3/16 1/4 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) - - 3/8–24 7/16–20, UNF2B TAP 7/16–20
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
PTO Height (in.) 3.4 - - - -
Bearing Type Ball Oil seal Ball Ball bearing -
Cylinders (qty.)
1 1 1 1 1
Cylinder Bore
Cast iron Aluminum alloy Cast iron Cast iron Cast iron
Bore x Stroke (in.)
1 3/8 x 1 2.7 x 2 2.7 x 2.0 3 29/64 x 2 1/2 3.2 x 2.5
Compression Ratio
8:1 8.5:1 8.5:1 7.7:1 7.7:1
Cooling System
Forced air Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Semi-dry Dry (paper) Dual element Dual element Dual element
Fuel Tank Yes Yes Yes Not included Yes
Fuel Type Gasoline Gasoline Gasoline Gasoline Gasoline
Fuel Tank Capacity (qt.)
0.61 0.98 0.98 - 2.2
Fuel Pump Accelerator pump in carburetor - Yes - -
Fuel Filter
Yes Yes Yes Yes Mesh fuel filter
Oil Capacity (qt.)
0.084 0.58 0.58 1.2 1.2
Lubrication System
Oil mist, crankshaft pressure-driven Forced splash Forced splash Pressure/splash Pressure/splash
Low Oil Alert
- No - Oil level switch No
Low Oil Shutdown - No - Oil level switch -
Ignition System
Transistorized magneto Electronic Electronic Transistorized magneto Electronic
Governor System
- Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical
Carburetor
Diaphragm (overflow return) Horizontal butterfly valve Horizontal butterfly valve Float Float
Throttle Control
Manual Fixed Remote Remote (rod) Remote (wire)
Choke Control
Manual Manual Remote (wire) Remote (rod) Remote (wire)
Max. RPM
7,000 3,600 3,600 3,600 3,600
Charging System Amps - - - - 3
Muffler Included
Yes Yes Yes Yes Yes
Flywheel Brake - No Yes - -
Auto Compression Release Yes Yes Yes Yes -
Bolt Circle (in.)
2.6 8 1/2 8 10 10
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 3/5 x 13 1/2 x 13 4/5 17 x 15 x 15 7/8 17 x 15 x 15 7/8
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes