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Honda GX630 QZB2 Horizontal V-Twin Engine

The Honda GX630 QZB2 Horizontal V-Twin Engine is a commercial-grade power unit designed for pressure washers, generators, pumps, construction equipment, agricultural machinery, and other demanding applications. Its 688cc air-cooled four-stroke OHV V-twin design produces 20.8 net horsepower at 3,600 rpm and 35.6 lb-ft of torque at 2,500 rpm.

Key Features

  • Commercial-grade 688cc OHV V-twin
  • 20.8 net horsepower
  • Electric start
  • 17-amp charging system
  • Control box with key switch
  • Manual throttle and choke controls
  • Perpendicular spin-on oil filter
  • Full-pressure lubrication
  • Digital CDI with variable timing
  • Honda Oil Alert system

Specifications

Specification Details
Model Honda GX630 QZB2
Engine code GX630RHQZB2
Engine type Air-cooled four-stroke OHV V-twin
Cylinders Two
Displacement 688cc
Net power 20.8 HP (15.5 kW) at 3,600 rpm
Maximum torque 35.6 lb-ft (48.3 Nm) at 2,500 rpm
Bore × stroke 78 × 72 mm
Compression ratio 9.3:1
Crankshaft orientation Horizontal
Crankshaft size 1″ × 2-29/32″
Shaft type Straight and keyed
Keyway 1/4″
Shaft tapping 3/8-24
PTO rotation Counterclockwise from PTO side
Starting system Electric
Charging system 17 amp
Control box/key switch Included
Throttle and choke Manual controls included
Ignition Digital CDI with variable timing
Fuel system Two-barrel carburetor
Governor Mechanical
Lubrication Full-pressure
Oil filter Spin-on, perpendicular to crankshaft
Oil capacity 2.0 liters
Air cleaner Dual element
Dry weight Approximately 96.8 lb (44 kg)
Fuel tank Not included
Muffler Not included

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