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Honda GX390 QNR2 Horizontal Engine with Electric Start

The Honda GX390 QNR2 is a commercial-grade horizontal-shaft engine designed for demanding construction, agricultural, and industrial equipment. Its 389cc air-cooled, four-stroke OHV design produces 11.7 net horsepower at 3,600 RPM and 19.5 lb-ft of torque at 2,500 RPM, delivering dependable power with excellent fuel efficiency.

Key Features

  • Commercial-grade 389cc OHV engine
  • Electric and recoil starting systems
  • 18-amp battery-charging system
  • 11.7 net HP at 3,600 RPM
  • 19.5 lb-ft torque at 2,500 RPM
  • One-inch Q-type keyed crankshaft
  • Digital CDI ignition with variable timing
  • Automatic mechanical decompression
  • Dual-element air cleaner
  • Cast-iron cylinder sleeve
  • Honda Oil Alert protection
  • Counterclockwise PTO rotation

Technical Specifications

Specification Details
Manufacturer Honda
Model GX390 QNR2
Manufacturer Part Number GX390UT2X-QNR2
Engine Type Air-cooled, four-stroke OHV
Cylinder Configuration Single cylinder
Displacement 389cc
Net Power 11.7 HP at 3,600 RPM
Maximum Torque 19.5 lb-ft at 2,500 RPM
Starting System Electric and recoil
Charging System 18 amp
Crankshaft Type Q-type straight keyed shaft
Shaft Dimensions 1″ x 3-31/64″
Keyway 1/4″
Tapped Shaft End 3/8″-24 UNF
Fuel Tank Capacity 6.4 US qt.
Engine Oil Capacity 1.16 US qt.
Air Cleaner Dual element
Ignition Digital CDI with variable timing
PTO Rotation Counterclockwise from PTO side
Fuel Unleaded gasoline, 86 octane or higher

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