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Honda GXV390 DEXT Vertical Engine, Replaces GXV390 DE33

The Honda GXV390 DEXT Vertical Engine is a commercial-grade 389cc replacement engine designed for riding mowers, brush cutters, and other demanding equipment with a vertical crankshaft. This configuration replaces the older Honda GXV390 DE33, subject to verification of the shaft, mounting pattern, and electrical connections.

Key Features

  • Commercial-grade Honda GXV Series construction
  • Replaces Honda GXV390 DE33
  • Electric and recoil starting systems
  • 3-amp charging coil
  • Spin-on oil filter
  • Cast-iron cylinder sleeve
  • Dual-element air cleaner
  • Muffler included
  • Mechanical centrifugal governor

Specifications

Specification Details
Model Honda GXV390 DEXT
Engine code GXV390UT1DEXT
Replaces GXV390 DE33
Engine type Air-cooled four-stroke OHV
Cylinders One
Displacement 389cc
Net power 10.2 HP at 3,600 rpm
Maximum torque 17.8 lb-ft at 2,500 rpm
Bore × stroke 88 × 64 mm
Compression ratio 7.7:1
Crankshaft orientation Vertical
Crankshaft size 1″ diameter × 3-5/32″ length
Starting system Electric and recoil
Charging system 3 amp
Lubrication Pressure and splash
Oil filter Spin-on oil filter
Oil capacity 1.1 liters
Fuel tank capacity 2.1 liters
Fuel type Unleaded gasoline, 86 octane or higher
PTO rotation Counterclockwise from PTO side
Muffler Included

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