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Honda GX-690 Engine
General Technical Data
Honda GX690 Engine Specifications
Engine Model ................ Honda GX690
Engine Type ................ 4-cycle overhead valve V-twin gasoline engine
Number of Cylinders ................ 2
Displacement, cu.in (cc) ................ 41.97 (688)
Engine Bore, in (mm) ................ 3.07 (78.0)
Engine Stroke, in (mm) ................ 2.83 (72.0)
Rated Engine Power, hp (kW) ................ 22.3 (16.5)
Rated Engine Speed, rpm ................ 3600
Maximum Torque, Nm (ft-lbs) ................ 48.3 (35.6)
Torque Speed, rpm ................ 2500
Compression Ratio ................ 9.3:1
Valve Arrangement ................ OHV
Lubrication System ................ Forced feed
Air Cleaner ................ Dual type
Cooling System ................ Forced air
Ignition System ................ Capacitor discharge ignition (C.D.I)
Spark Advancer ................ Electronic type
Breather System ................ Reed valve type
Stopping System ................ Ignition circuit open
Starting System ................ Starter motor
Fuel System
Fuel System Type ................ Carburetor
Carburetor Type ................ Horizontal, 2 barrels with butterfly valve
Governor Type ................ Mechanical centrifugal
Fuel Consumption, l/h (gal/h) ................ 6.7 (1.77)
Fuel Type ................ Gasoline (86 or higher)
Dimensions and Weight
Length, in (mm) ................ 16.9 (429)
Width, in (mm) ................ 16.1 (410)
Height, in (mm) ................ 17.2 (438)
Net Weight, lbs (kg) ................ 99.2 (45.0)
Operating Weight, lbs (kg) ................ 102.7 (46.6)
Honda GX690 Maintenance Data
Cylinder Block and Valves
Cylinder Bore Inside Diameter (Maximum), in (mm) ................ 3.0768 (78.150)
Cylinder Compression, psi (kPa) ................ 73-102 (500-700)
Cylinder Head (Max. Out of Flatness), in (mm) ................ 0.004 (0.10)
Intake Valve Clearance, in (mm) ................ 0.003 (0.08)
Exhaust Valve Clearance, in (mm) ................ 0.004 (0.10)
Engine Oil and Filters
Engine Oil Type (Summer) ................ SAE 10W-30
Engine Oil Type (Winter) ................ SAE 5W-30
API Service Classifications ................ SE or higher
Oil Capacity (with Filter), qts (L) ................ 1.8 (1.7)
Oil Filter Part Number ................ 15400-PLM-A02
Air Filter Part Number ................ 17210-Z6L-010
Fuel Filter Part Number ................ 16910-Z6L-003
Carburetor Adjustment
Main Jet (No.1/2 cyl.) ................ #118 / #118
Idle Fuel (No.1/2 cyl.) ................ 1-7/8 turns out / 1-3/4 turns out
Float Height, in (mm) ................ 0.61 (15.5)
Low Idle Speed, rpm ................ 1400±150
High Idle Speed, rpm ................ 3850±150
Ignition System
Spark Plug Type ................ NGK ZFR5F
Spark Plug Gap, in (mm) ................ 0.028-0.032 (0.70-0.80)
Module Air Gap, in (mm) ................ 0.008-0.024 (0.20-0.60)
Ignition Timing, deg ................ 9 BTDC
Spark Advancer Performance, deg ................ 9-23 BTDC
Spark Plug Torque, Nm (ft-lbs) ................ 18 (13)
Service Intervals
Service Air Filter Element ................ Every 100 hours
Change Engine Oil ................ Every 100 hours
Replace Engine Oil Filter ................ Every 200 hours
Check and Adjust Spark Plug ................ Every 100 hours
Replace Fuel Filter Element ................ Every 300 hours
Check Carburetor Adjustment ................ Every 300 hours
Check and Adjust Valve Clearance ................ Every 300 hours
Replace Spark Plug ................ Every 300 hours
Replace Air Filter Element ................ Every 500 hours
Honda GX690 Service Specifications
Cylinder Block
Cylinder Bore Inside Diameter (Std), in (mm) ................ 3.0709-3.0715 (78.000-78.015)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) ................ 3.0768 (78.150)
Connecting Rod Small End Inside Diameter (Std), in (mm) ................ 0.7089-0.7094 (18.006-18.018)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) ................ 0.711 (18.07)
Connecting Rod Big End Inside Diameter (Std), in (mm) ................ 1.7712-1.7721 (44.988-45.012)
Connecting Rod Big End Inside Diameter (Wear Limit), in (mm) ................ 1.7736 (45.050)
Connecting Rod Big End Oil Clearance, in (mm) ................ 0.0002-0.0015 (0.005-0.039)
Crankshaft Main Journal Outside Diameter (Std), in (mm) ................ 1.5742-1.5748 (39.984-40.000)
Crankshaft Main Journal Outside Diameter (Wear Limit), in (mm) ................ 1.5720 (39.930)
Crank Pin Outside Diameter (Std), in (mm) ................ 1.7706-1.7710 (44.973-44.983)
Crank Pin Outside Diameter (Wear Limit), in (mm) ................ 1.7685 (44.920)
Cylinder Head and Valves
Cylinder Head (Max. Out of Flatness), in (mm) ................ 0.004 (0.10)
Intake Valve Clearance, in (mm) ................ 0.002-0.004 (0.06-0.10)
Exhaust Valve Clearance, in (mm) ................ 0.003-0.005 (0.08-0.12)
Intake Valve Stem Outside Diameter (Std), in (mm) ................ 0.2156-0.2161 (5.475-5.490)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) ................ 0.2126 (5.400)
Exhaust Valve Stem Outside Diameter (Std), in (mm) ................ 0.2140-0.2146 (5.435-5.450)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) ................ 0.2087 (5.300)
Valve Guide Inside Diameter (Intake/Exhaust), in (mm) ................ 0.2165-0.2170 (5.500-5.512)
Intake Valve Guide To Stem Clearance, in (mm) ................ 0.0004-0.0015 (0.010-0.037)
Exhaust Valve Guide To Stem Clearance, in (mm) ................ 0.0020-0.0030 (0.050-0.077)
Valve Seat Width (Intake/Exhaust), in (mm) ................ 0.04-0.05 (1.0-1.2)
Valve Spring Free Length, in (mm) ................ 1.51 (38.30)
Valve Lifter Shaft Outside Diameter, in (mm) ................ 0.2350-0.2362 (5.97-6.00)
Valve Lifter Inside Diameter, in (mm) ................ 0.2366-0.2378 (6.01-6.04)
Cam Height (Intake), in (mm) ................ 1.1617-1.1695 (29.506-29.706)
Cam Height (Exhaust), in (mm) ................ 1.1579-1.1657 (29.410-29.610)
Camshaft Journal Outside Diameter, in (mm) ................ 0.6686-0.6693 (16.982-17.000)
Piston and Piston Rings
Piston Pin Bore Inside Diameter (Std), in (mm) ................ 0.7087-0.7090 (18.002-18.008)
Piston Pin Bore Inside Diameter (Wear Limit), in (mm) ................ 0.7103 (18.042)
Piston Skirt Outside Diameter, in (mm) ................ 3.0703-3.0707 (77.985-77.995)
Piston to Cylinder Bore Clearance, in (mm) ................ 0.0002-0.0012 (0.005-0.030)
Piston Pin Outside Diameter (Std), in (mm) ................ 0.7084-0.7087 (17.994-18.000)
Piston Pin Outside Diameter (Wear Limit), in (mm) ................ 0.7068 (17.954)
Top Compression Ring Width, in (mm) ................ 1.140-1.155 (0.0449-0.0455)
Second Compression Ring Width, in (mm) ................ 1.140-1.155 (0.0449-0.0455)
Top Compression Ring to Groove Side Clearance, in (mm) ................ 0.0020-0.0031 (0.050-0.080)
Second Compression Ring to Groove Side Clearance, in (mm) ................ 0.0020-0.0031 (0.050-0.080)
Top Compression Ring End Gap, in (mm) ................ 0.0079-0.0138 (0.200-0.350)
Second Compression Ring End Gap, in (mm) ................ 0.0079-0.0138 (0.200-0.350)
Oil Ring End Gap, in (mm) ................ 0.008-0.028 (0.20-0.70)
Ring End Gap (Wear Limit), in (mm) ................ 0.04 (1.00)
Honda GX690 Tightening Torque Specs
Cylinder Nut (M10x1.25), Nm (ft-lb) ................ 37 (27)
Governor Arm Nut (M6x1.0), Nm (ft-lb) ................ 11 (8)
Starter Motor Terminal Nut (M8x1.25), Nm (ft-lb) ................ 9 (6.6)
Oil Drain Plug Bolt (M20x1.5), Nm (ft-lb) ................ 45 (33)
Connecting Rod Bolt (M7x1.0), Nm (ft-lb) ................ 22 (16)
Flywheel Bolt (M20x1.5), Nm (ft-lb) ................ 235 (173)
Oil Filter Cartridge (M20x1.5), Nm (ft-lb) ................ 12 (9)
Fuel Pump Screw (M6x1.0), Nm (ft-lb) ................ 3.1 (2.2)
Breather Valve Screw (M3x0.5), Nm (ft-lb) ................ 1 (0.7)
Tappet Adjusting Nut (M5x0.5), Nm (ft-lb) ................ 7.5 (5.5)
Air Cleaner Wing Nut (M6x1.0), Nm (ft-lb) ................ 0.8 (0.6)
Spark Plug (M14x1.25), Nm (ft-lb) ................ 18 (13)
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