The Robin EX21 (frequently associated with Robin-Subaru) is a heavy-duty, industrial-grade 7.0-horsepower petrol engine. Known for its robust reliability, high torque output, and overhead cam (OHC) design, the EX21 has built a stellar reputation as a premier power plant for construction equipment, generators, water pumps, and pressure washers
Key Technical Specifications
Engine Type: Air-cooled, 4-cycle, single-cylinder, Overhead Cam (OHC), horizontal PTO shaft
Displacement: 211 cc
Maximum Output: 7.0 HP (5.1 kW) at 4,000 RPM
Continuous Output: 5.0 HP (3.7 kW) at 3,600 RPM
Maximum Torque: 13.9 Nm (approx. 10.26 ft-lbs) at 2,500 RPM
Fuel Tank Capacity: 3.6 Liters (approx. 0.95 gallons)
Oil Capacity: 0.6 Litres
Dry Weight: 16 kg (35 lbs)
Standout Features & Benefits
Overhead Cam (OHC) Technology: Unlike traditional side-valve engines, the OHC layout allows for a more efficient combustion chamber, optimised valve timing, and lower fuel consumption.
Exceptional Durability: Features a cast iron cylinder liner, a robust aluminium alloy block, and dual ball-bearing-supported crankshafts designed to handle intense, continuous commercial workloads.
Low Noise & Vibration: Engineered with larger cooling fins, a rigid muffler with a soft tone quality, and precision balancing to minimise vibration and operate quietly (around 68 dB at 7 meters).
Easy and Safe Operation: Incorporates an automatic decompression system for smooth, kickback-free recoil starting, alongside safety features like a low-oil sensor shutdown.
Common Applications
Because of its reliable power delivery across a wide torque band, you will frequently find the Robin EX21 powering:
Plate compactors and concrete trowels
Industrial portable generators (e.g., up to ~3,600W units)
High-pressure water blasters and trash pumps
Agricultural and turf equipment
The Robin EX21 (frequently associated with Robin-Subaru) is a heavy-duty, industrial-grade 7.0-horsepower petrol engine. Known for its robust reliability, high torque output, and overhead cam (OHC) design, the EX21 has built a stellar reputation as a premier power plant for construction equipment, generators, water pumps, and pressure washers
Key Technical Specifications
Engine Type: Air-cooled, 4-cycle, single-cylinder, Overhead Cam (OHC), horizontal PTO shaft
Displacement: 211 cc
Maximum Output: 7.0 HP (5.1 kW) at 4,000 RPM
Continuous Output: 5.0 HP (3.7 kW) at 3,600 RPM
Maximum Torque: 13.9 Nm (approx. 10.26 ft-lbs) at 2,500 RPM
Fuel Tank Capacity: 3.6 Liters (approx. 0.95 gallons)
Oil Capacity: 0.6 Litres
Dry Weight: 16 kg (35 lbs)
Standout Features & Benefits
Overhead Cam (OHC) Technology: Unlike traditional side-valve engines, the OHC layout allows for a more efficient combustion chamber, optimised valve timing, and lower fuel consumption.
Exceptional Durability: Features a cast iron cylinder liner, a robust aluminium alloy block, and dual ball-bearing-supported crankshafts designed to handle intense, continuous commercial workloads.
Low Noise & Vibration: Engineered with larger cooling fins, a rigid muffler with a soft tone quality, and precision balancing to minimise vibration and operate quietly (around 68 dB at 7 meters).
Easy and Safe Operation: Incorporates an automatic decompression system for smooth, kickback-free recoil starting, alongside safety features like a low-oil sensor shutdown.
Common Applications
Because of its reliable power delivery across a wide torque band, you will frequently find the Robin EX21 powering:
Plate compactors and concrete trowels
Industrial portable generators (e.g., up to ~3,600W units)
High-pressure water blasters and trash pumps
Agricultural and turf equipment
