Gx630 f main

GX630 (20 hp)

This is the engine that has raised the bar with high horsepower, quiet operation and excellent fuel efficiency.

GX630 Features and applications


Digital CDI ignition system with variable timing
Hemispherical combustion chamber delivers rapid combustion
Integrated cylinder and head
High-capacity pump facilitates consistent oil delivery
Automatic mechanical de-compression system


Pressure washers
Commercial lawn and garden equipment
Forestry equipment
Construction/industrial equipment
Agricultural equipment
Small vehicles
Water pumps

GX630 Specifications

Engine type air-cooled 4-stroke OHV, 90° V-twin cylinders
Bore x Stroke 78 x 72 mm (3.07 x 2.83 in)
Displacement 688 cc (41.97 cu-in)
Net power output 15.5 kW (20.8 hp) @ 3 600 rpm
Net torque 48.3 Nm (35.6 lb-ft) @ 2 500 rpm
PTO shaft rotation counterclockwise (from PTO shaft side)
Compression ratio 9.3 : 1
Fuel tank capacity fuel tank not included
Carburetor horizontal type, two barrel butterfly valve, internal vent
Ignition system digital CDI with variable ignition timing
Lubrication system forced lubrication
Governor system centrifugal mechanical
Oil capacity without oil filtre replacement : 1.5 L (1.32 (Imp) qt, 1.59 US qt)with oil filtre replacement : 1.7 L (1.5 (Imp) qt, 1.80 US qt)
Fuel unleaded gasoline with a pump octane rating of 86 or higher

GX630 Engine types / Horizontal Crankshaft

Model code PTO type PTO diameter/taper PTO reduction Starter Oil alert (shut down) Air filter type
straight 1" no electric yes dual element
Gx690rh t type
GX630RHQZB3 Download diagram
PTO type straight
PTO diameter/taper 1"
PTO reduction no
PTO bolt size 3/8 - 24 UNF 2B TAP
Starter electric
Oil alert (shut down) yes
Air filter type dual element
Muffler type optional
Loading coil 17A
Dry weight 44 kg (96.9 lb)
Model code GCAMH, GCBEK