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

Item# 44258
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Only $219.99

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Manufacturer's Warranty: 2 years consumer use / 1 year commercial use

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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

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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
  • Reliable, starts easy and runs quiet
  • Great for use with construction equipment

Key Specs

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Item#44258
Ship Weight15.0 lbs
Engine Displacement (cc)25
Start TypeRecoil
ApplicationString trimmer, mini-tiller and other high-RPM applications
Engine TypeGX series 4-stroke OHC
Torque (ft./lbs.)0.74 @ 5,000 RPM
Shaft OutputHorizontal
CrankshaftHorizontal
Shaft Diameter (in.)Clutch
Shaft Length (in.)Crank/piston assembly
Shaft Rotation (From PTO Shaft Side)Counterclockwise
PTO Height (in.)3.5
Bearing TypeBall
Cylinders (qty.)1
Cylinder BoreCast iron
Bore x Stroke (in.)1 3/8 x 1
Compression Ratio8:1
Cooling SystemForced air
Air Cleaner TypeSemi-dry
Fuel TankYes
Fuel TypeGasoline
Fuel Tank Capacity (qt.)0.61
Fuel FilterYes
Oil Capacity (qt.)0.0084
Lubrication SystemOil mist, crankshaft pressure-driven
Ignition SystemTransistorized magneto
CarburetorDiaphragm (overflow return)
Throttle ControlManual
Choke ControlManual
Max. RPM7,000
Muffler IncludedYes
Auto Compression ReleaseYes
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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Extended Warranty

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Service Protection Plus

Manufacturer Warranty:
2 years consumer use / 1 year commercial use

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

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Honda Horizontal OHC Engine — 25cc, GX Series, Clutch with Crank/Piston Assembly, Model# GX25NTS3 The price is $219.99.
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Engine Displacement (cc)
25 160 160 160 340
Start Type
Recoil Recoil Recoil Recoil Electric w/recoil backup
Application String trimmer, mini-tiller and other high-RPM applications Lawn mower, chipper/vac, log splitter, pressure washer Walk-behind mower, chipper/vac Walk-behind mower Commerical turf equipment, lawn tractor, riding mower
Engine Type GX series 4-stroke OHC GCV series OHV commercial-duty GCV series OHV commercial-duty GXV series OHV commercial-duty GXV series OHV commercial-duty
Rated Power (HP)
- 4.4 4.4 4.3 8.9
Torque (ft./lbs.)
0.74 @ 5,000 RPM 6.9 @ 2,500 RPM 6.9 @ 2,500 RPM 7.10 at 2,500 RPM 15.90 @ 2,500 RPM
Shaft Output
Horizontal Vertical Vertical Vertical Vertical
Crankshaft Horizontal N3 type N1 type - -
Shaft Diameter (in.) Clutch 63/64 (25mm) 7/8 7/8 1
Shaft Length (in.) Crank/piston assembly 3 5/32 3 5/32 3 1/16 3 1/8
Shaft Keyway (in.)
- - 3/16 - 1/4
Shaft End Tapped (Diameter (in.)/Threads per inch) - - 3/8–24 7/8–24 7/16–20
Shaft Rotation (From PTO Shaft Side) Counterclockwise Counterclockwise Counterclockwise Counterclockwise Counterclockwise
PTO Height (in.) 3.5 - - - -
Bearing Type 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 2.5 x 2.0 2.7 x 1.8 3.2 x 2.5
Compression Ratio
8:1 8.5:1 8.5:1 8.0:1 7.7:1
Cooling System
Forced air Air cooled Air cooled Air cooled Air cooled
Air Cleaner Type
Semi-dry Dry (paper) type Dry (paper) type 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 1.9 2.2
Fuel Filter
Yes - - - Mesh fuel filter
Oil Capacity (qt.)
0.0084 0.58 0.58 0.69 1.2
Lubrication System
Oil mist, crankshaft pressure-driven Forced splash Forced splash Forced splash Pressure/splash
Low Oil Alert
- - - - No
Ignition System
Transistorized magneto Electronic Electronic Electronic Electronic
Governor System
- Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical Centrifugal mechanical
Carburetor
Diaphragm (overflow return) Float Float Float Float
Throttle Control
Manual - Manual Manual Remote (wire)
Choke Control
Manual - Remote (wire) Remote (wire) 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 - Yes Yes Yes -
Auto Compression Release Yes - - Yes -
Bolt Circle (in.)
2.6 8 1/2 8 1/2 8 10
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 14 3/8 x 13 x 13 13/16 14 3/8 x 13 x 13 13/16 16 5/16 x 14 1/8 x 13 7/8 17 x 15 x 15 7/8
EPA/CARB Approval (California Air Resource Board)
Yes Yes Yes Yes Yes