HONDA® GX390 QZNR HORIZONTAL ENGINE W/ ELECTRIC START + POTENTIOMETER MODE

Performance & Efficiency

• Digital CDI ignition system with variable timing ensures reliable starting and optimized combustion.
• Higher compression ratio and precision camshaft design deliver accurate valve timing and ideal valve overlap for improved fuel efficiency.
• OHV (Overhead Valve) design enhances combustion efficiency and power transfer.
  

Smooth Operation

• Precision-engineered components minimize vibration and enhance overall engine balance.
  

Quiet & Clean Performance

• Large-capacity, multi-chamber exhaust system significantly reduces engine noise.
• Improved camshaft and muffler design lower overall sound output by up to 5 dB, contributing to a smoother, quieter operation.
  

Ease of Use & Maintenance

• Simple throttle control and large-capacity fuel tank for extended run times.
• Dual oil drains and fills for flexible installation and maintenance.
• Easily accessible spark plug for quick servicing.
• Automatic mechanical decompression system for effortless starting.
  

Engine Brand: Honda

Model Number: GX390 QZNR

Warranty: 3-Year Residential | 3-Year Commercial

Performance

Power Output: 11.7 HP @ 3,600 rpm

Torque: 19.5 lb-ft (26.5 Nm) @ 2,500 rpm

Crankshaft Specifications

Orientation: Horizontal

Type: Straight

Diameter: 1"

Length: 3-31/64"

End Tapped Size: 3/8-24 UNF (2B Tap)

Keyway: 1/4"

Rotation Direction: Counterclockwise (from PTO shaft side)

Starting & Ignition

Starter Type: Electric & Recoil

Ignition System: Digital CDI with Variable Ignition Timing

Carburetor: Butterfly Float

Engine Construction

Number of Cylinders: One

Cylinder Bore: Cast Iron Sleeve

Bore x Stroke: 88 mm x 64 mm

Compression Ratio: 8.2:1

Lubrication & Fuel

Oil Capacity: 1.16 qt

Fuel Type: Unleaded gasoline (86 octane or higher)

Fuel Pump: N/A

Governor System: Centrifugal Mass

Charging & Air Systems

Air Cleaner: —

Charging System: 18 Amp

Controls: —