Honda GXV660 Specifications
| Engine Model: Honda GXV660 |
| Engine Type: 4-cycle V-twin cylinder OHV air-cooled gasoline |
| Total Displacement: 41.9 cu.in (688 cc) |
| Rated Engine Power: 21.6 Hp (16 kW) at 3600 rpm |
| Carburetor Type: Two-barrels with butterfly valve |
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Engine Model .............. Honda GXV660
Engine Type .............. 4-cycle overhead valve V-twin gasoline engine
Number of Cylinders .............. 2
Displacement, cu.in (cc) .............. 41.97 (688)
Cylinder Bore, in (mm) .............. 3.07 (78.0)
Piston Stroke, in (mm) .............. 2.83 (72.0)
Rated Engine Power, hp (kW) .............. 21.6 (16.0)
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 Type .............. Carburetor
Carburetor Type .............. Horizontal, two barrels with butterfly valve
Governor Type .............. Centrifugal
Fuel Consumption, l/h (gal/h) .............. 5.3 (1.40)
Fuel Type .............. Gasoline (86 or higher)
Overall Length, in (mm) .............. 17.7 (449)
Overall Width, in (mm) .............. 16.5 (420)
Overall Height, in (mm) .............. 18.2 (463)
Dry Weight, lbs (kg) .............. 101.2 (45.9)
Operating Weight, lbs (kg) .............. 105.4 (47.8)
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 (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.003±0.001 (0.08±0.02)
Exhaust Valve Clearance, in (mm) .............. 0.004±0.001 (0.10±0.02)
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 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 Ring Width, in (mm) .............. 1.140-1.155 (0.0449-0.0455)
Second Ring Width, in (mm) .............. 1.140-1.155 (0.0449-0.0455)
Top Ring Groove Side Clearance, in (mm) .............. 0.0020-0.0031 (0.050-0.080)
Second Ring Groove Side Clearance, in (mm) .............. 0.0020-0.0031 (0.050-0.080)
Top Ring End Gap, in (mm) .............. 0.0079-0.0138 (0.200-0.350)
Second 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)
Cylinder Bore Inside Diameter (Max), 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 Type (Summer) .............. SAE 10W-30
Engine Oil Type (Winter) .............. SAE 5W-30
API Service Classifications .............. SJ or higher
Oil Capacity (with Filter), qts (L) .............. 2.01 (1.90)
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
Oil Filter Part Number .............. 15400-PLM-A01PE
Air Filter Part Number .............. 17210-Z6M-010
Fuel Filter Part Number .............. 16910-Z6L-003
Main Jet (No.1/2 cyl.) .............. #110 / #115
Idle Fuel (No.1/2 cyl.) .............. 2 turns out / 2-1/8 turns out
Float Height, in (mm) .............. 0.61 (15.5)
Low Idle Speed, rpm .............. 1400±150
High Idle Speed, rpm .............. 3400±150
Check Engine Oil Level .............. Every 10 hours
Clean Air Filter Element .............. Every 100 hours
Change Engine Oil .............. Every 100 hours
Check and Adjust Spark Plug .............. Every 100 hours
Replace Engine Oil Filter .............. Every 200 hours
Check and Adjust Idle Speed .............. Every 300 hours
Check Carburetor Adjustments .............. Every 300 hours
Replace Spark Plug .............. Every 300 hours
Replace Fuel Filter .............. Every 300 hours
Replace Air Filter Element .............. Every 500 hours
Check and Adjust Valve Clearance .............. Every 500 hours
Clean Combustion Chamber .............. Every 500 hours
Clean Fuel Line .............. Every 500 hours
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)
Spark Plug (M14x1.25), Nm (ft-lb) .............. 18 (13)
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