The Robin EX40 (often recognised as Robin-Subaru) is a powerhouse within the EX series, representing a heavy-duty, commercial-grade 14.0-horsepower petrol engine. Designed for the most demanding industrial, construction, and agricultural tasks, it steps up displacement and torque significantly from the EX27, serving as a reliable alternative to larger V-twin engines while maintaining a compact, single-cylinder footprint.
Key Technical Specifications
Engine Type: Air-cooled, 4-cycle, single-cylinder, Chain-Driven Overhead Cam (OHC), horizontal PTO shaft
Displacement: 404 cc
Maximum Output: 14.0 HP (10.3 kW) at 4,000 RPM
Maximum Torque: 28.5 Nm (approx. 21.0 ft-lbs) at 2,500 RPM
Fuel Tank Capacity: 7.0 Liters (approx. 1.85 US gallons)
Oil Capacity: 1.2 Liters (approx. 40 oz.)
Dry Weight: Approx. 33 kg (73 lbs)
Starting System: Typically configured with a reliable recoil start and an optional electric start setup
Standout Features & Benefits
High-Torque Performance: The 404 cc displacement combined with the OHC design delivers massive pulling power at lower RPMs, preventing the engine from bogging down under sudden, heavy shock loads.
Heavy-Duty Construction: Features a robust cast-iron cylinder sleeve, high-strength forged steel crankshaft supported by dual ball bearings, and heavy-duty crankcase covers engineered for long commercial life cycles.
Advanced OHC Cooling & Efficiency: The chain-driven overhead cam design optimizes the combustion chamber shape for better fuel efficiency, cleaner emissions, and reduced thermal stress.
Reduced Vibration and Noise: Despite its high output, the EX40 utilizes precision counter-balancing and a large-capacity muffler to keep vibrations low and operational noise comfortable.
Common Applications
The high horsepower and rugged endurance of the EX40 make it a popular choice for heavy-duty machinery, including:
Large portable generators and backup power units
Commercial-grade pressure washers and industrial trash pumps
Concrete trowels, saws, and heavy-duty plate compactors
Large log splitters and wood chippers
Turf care machinery and agricultural tractors
The Robin EX40 (often recognised as Robin-Subaru) is a powerhouse within the EX series, representing a heavy-duty, commercial-grade 14.0-horsepower petrol engine. Designed for the most demanding industrial, construction, and agricultural tasks, it steps up displacement and torque significantly from the EX27, serving as a reliable alternative to larger V-twin engines while maintaining a compact, single-cylinder footprint.
Key Technical Specifications
Engine Type: Air-cooled, 4-cycle, single-cylinder, Chain-Driven Overhead Cam (OHC), horizontal PTO shaft
Displacement: 404 cc
Maximum Output: 14.0 HP (10.3 kW) at 4,000 RPM
Maximum Torque: 28.5 Nm (approx. 21.0 ft-lbs) at 2,500 RPM
Fuel Tank Capacity: 7.0 Liters (approx. 1.85 US gallons)
Oil Capacity: 1.2 Liters (approx. 40 oz.)
Dry Weight: Approx. 33 kg (73 lbs)
Starting System: Typically configured with a reliable recoil start and an optional electric start setup
Standout Features & Benefits
High-Torque Performance: The 404 cc displacement combined with the OHC design delivers massive pulling power at lower RPMs, preventing the engine from bogging down under sudden, heavy shock loads.
Heavy-Duty Construction: Features a robust cast-iron cylinder sleeve, high-strength forged steel crankshaft supported by dual ball bearings, and heavy-duty crankcase covers engineered for long commercial life cycles.
Advanced OHC Cooling & Efficiency: The chain-driven overhead cam design optimizes the combustion chamber shape for better fuel efficiency, cleaner emissions, and reduced thermal stress.
Reduced Vibration and Noise: Despite its high output, the EX40 utilizes precision counter-balancing and a large-capacity muffler to keep vibrations low and operational noise comfortable.
Common Applications
The high horsepower and rugged endurance of the EX40 make it a popular choice for heavy-duty machinery, including:
Large portable generators and backup power units
Commercial-grade pressure washers and industrial trash pumps
Concrete trowels, saws, and heavy-duty plate compactors
Large log splitters and wood chippers
Turf care machinery and agricultural tractors
