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HONDA GX25
Meet the world's lightest OHC engine. Honda applied our superior engine technology to create the world’s first 360° inclinable 4-Stroke engines. The ultra-lightweight GX25 Mini 4-Stroke efficiently delivers the kind of efficient cleaner, powerful, quiet performance that you’d expect from a larger engine – but in a very compact package.
Common Applications
  • Commercial lawn and garden equipment
  • Tillers / cultivators
  • Construction / industrial equipment
  • Agricultural equipment
  • Water pumps

Features & Benefits

Specifications

Advanced Technology
  • 4-stroke - no fuel/oil mixing
  • Full 360° "any-side-up" operation - use and store in any position
  • Exclusive rotary-slinger lubrication system
  • The world's lightest OHC engine

Exceptionally Quiet
  • Belt-driven OHC design reduces mechanical noise Learn More
  • Large capacity, multi-chamber exhaust system
  • Sophisticated air intake system
Model Number GX25
Engine Type Air cooled 4-stroke OHC
Bore & Strike 35mm x 26 mm
Total Displacement 25 cm³
Max Horsepower (Gross) 1.0 HP (.72 kW) @ 7,000 rpm
Max Torque .74 lb-ft (1.0 Nm) @ 5,000 rpm
P.T.O. Shaft Rotation Counterclockwise (viewed from P.T.O. side)
Compression Ratio 8.0:1
Carburetor Diaphragm-type (overflow return)
Ignition System Transistorized magneto ignition
Starting System Recoil
Lubricating System Crankcase Pressure-driven
Governor System NA
Air Cleaner Simi-dry type
Oil Capacity 2.7 US oz (80 cc)
Fuel Used Unleaded gasoline (minimum 86 octane)
Fuel tank capacity 0.61 US qt (0.58 liter)
Dry Weight 6.8 lb (2.7 kg)
   January  23, 2026