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| Home / Engines / Honda Engines / Honda GXV120 |
Honda GXV120 Maintenance
| Engine Model: Honda GXV120 |
| Engine Type: 4-cycle overhead valve 1-cylinder air-cooled gasoline engine |
| Total Displacement: 7.2 cu.in (118 cc) |
| Rated Engine Power: 4 Hp (2.9 kW) at 3600 rpm |
| Fuel System: Horizontal carburetor with butterfly valve |
| Service Data |
Cylinder Bore Inside Diameter (Maximum), in (mm) .............. 2.3687 (60.165)
Cylinder Compression, psi (kPa) .............. 71-102 (490-695)
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.006 (0.15)
Exhaust Valve Clearance, in (mm) .............. 0.008 (0.20)
| Engine Oil and Filter |
Engine Oil Type (Summer) .............. SAE 10W-30, 10W-40
Engine Oil Type (Winter) .............. SAE 5W-30
API Service Classifications .............. SE or SF
Oil Capacity, qts (L) .............. 0.65 (0.60)
Air Filter Element Part Number .............. 17210-ZE6-505
| Carburetor Adjustment |
Main Jet .............. #65
Idle Fuel .............. 3 turns out
Float Height, in (mm) .............. 0.48-0.60 (12.2-15.2)
Low Idle Speed, rpm .............. 2000±150
High Idle Speed, rpm .............. 3100±150
| Ignition System |
Spark Plug Type .............. NGK BPR5ES or Denso W16EPR-U
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 .............. 25 BTDC
Spark Plug Torque, Nm (ft-lbs) .............. 20 (14)
| Service Intervals |
Check Engine Oil Level .............. Every 10 hours
Clean Air Filter Element .............. Every 50 hours
Change Engine Oil .............. Every 100 hours
Check and Adjust Spark Plug .............. Every 100 hours
Check and Adjust Idle Speed .............. Every 200 hours
Check Carburetor Adjustment .............. Every 200 hours
Replace Spark Plug .............. Every 200 hours
Clean Fuel Filter .............. Every 200 hours
Replace Air Filter Element .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 200 hours
Clean Combustion Chamber .............. Every 250 hours
Clean Fuel Line .............. Every 250 hours
| Tightening Torques |
Oil Pan Bolt (M6x1.0) .............. 10-14 Nm (7.2-10.1 ft-lb)
Cylinder Head Cover Bolt (M6x1.0) .............. 8-12 Nm (5.8-8.7 ft-lb)
Cylinder Head Stud (M8x1.25x45) .............. 22-26 Nm (15.9-18.8 ft-lb)
Oil Drain Plug Bolt (M10x1.25) .............. 15-20 Nm (10.8-14.5 ft-lb)
Connecting Rod Bolt (M7x1.0) .............. 10-14 Nm (7.2-10.1 ft-lb)
Flywheel Nut (M14x1.5) .............. 70-80 Nm (50.6-57.9 ft-lb)
Muffler Bolt (M6x1.0) .............. 8-12 Nm (5.8-8.7 ft-lb)
Rocker Arm Pivot Bolt (M8x1.25) .............. 22-26 Nm (15.9-18.8 ft-lb)
Air Cleaner Case Bolt (M6x1.0) .............. 7-10 Nm (5.1-7.2 ft-lb)
Governor Arm Nut (M6x1.0) .............. 8-11 Nm (5.8-8 ft-lb)
Spark Plug (M14x1.25) .............. 20 Nm (14 ft-lb)
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