Honda GX630, Workshop Manual

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SPECIFICATIONS
1-3
ENGINE SPECIFICATIONS
*: The power rating of the engine indicated in this document is the net power output tested on a production engine for the engine
model and measured in accordance with SAE J1349 at 3,600 rpm (net power) and at 2,500 rpm (max net torque). Mass
production engines may vary from this value. Actual power output for the engine installed in the final machine will vary depending
on numerous factors, including the operating speed of the engine in application, environmental conditions, maintenance, and
other variables.
Model GX630 GX630R GX660 GX660R GX690 GX690R
Description code GCBBK GCBEK GCBCK GCBFK GCBDK GCBGK
Type 4 stroke, overhead valve, 90° V–twin cylinder
Displacement 688.0 cm 3 (41.97 cu–in)
Bore x stroke 78.0 x 72.0 mm (3.07 x 2.83 in)
Net power (SAE J1349)* 15.5 kW (21.1 PS) /
3,600 min
-1
(rpm)
16.0 kW (21.8 PS) /
3,600 min
-1
(rpm)
16.5 kW (22.4 PS) /
3,600 min
-1
(rpm)
Continuous rated power 12 kW (16.3 PS) /
3,600 min -1 (rpm)
12.5 kW (17.0 PS) /
3,600 min -1 (rpm)
13 kW (17.7 PS) /
3,600 min -1 (rpm)
Maximum net torque (SAE J1349)* 48.3 N·m
(4.93 kgf·m, 35.6 lbf·ft)
/ 2,500 min
-1
(rpm)
48.3 N·m
(4.93 kgf·m, 35.6 lbf·ft)
/ 2,500 min
-1
(rpm)
48.3 N·m
(4.93 kgf·m, 35.6 lbf·ft)
/ 2,500 min
-1
(rpm)
Maximum rpm (at no load) 3,850 ± 150 min-1 (rpm)
Compression ratio 9.3 ± 0.2
Fuel consumption (at continuous rated
power)
6.0 Liters (1.59 US gal,
1.32 Imp gal) / h
6.3 Liters (1.66 US gal,
1.39 Imp gal) / h
6.7 Liters (1.77 US gal,
1.47 Imp gal) / h
Ignition system C.D.I.(Capacitor Discharge Ignition) type magneto
Ignition timing B.T.D.C. 9° / 1,000 min-1 (rpm)
Spark advancer type Electronic type
Spark advancer performance B.T.D.C. 9° – 23°
Spark plug ZFR5F (NGK)
Lubrication system Forced feed
Oil capacity Without oil filter replacement: 1.5 Liters (1.59 US qt, 1.32 Imp qt)
With oil filter replacement: 1.7 Liters (1.80 US qt, 1.50 Imp qt)
Recommended oil SAE 10W-30 API service classification SE or later
Cooling system Forced air
Starting system Starter motor
Stopping system Ignition primary circuit open
Carburetor 2 barrel horizontal type, butterfly valve
Air cleaner Dual type
Governor Mechanical centrifugal
Breather system Reed valve type, PCV (Positive Crankcase Ventilation) type
Fuel used Unleaded gasoline with a pump octane rating 86 or higher
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