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| Home / Small Engines / Honda Engines / Honda GX100 |
Honda GX100 Maintenance
| Engine Model: Honda GX100 |
| Engine Type: 4-cycle 1-cylinder air-cooled gasoline engine |
| Total Displacement: 6.0 cu.in (98 cc) |
| Rated Engine Power: 3.0 Hp (2.3 kW) at 4000 rpm |
| Carburetor Type: Horizonal, butterfly valve |
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| Service Data |
Cylinder Bore Inside Diameter (Maximum), in (mm) .............. 2.2112 (56.165)
Cylinder Compression, psi (kPa) .............. 71 (490)
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) .............. SAE30, SAE 10W-30
Engine Oil Type (Winter) .............. SAE 5W-30
API Service Classifications .............. SJ or higher
Oil Capacity, qts (L) .............. 0.42 (0.40)
Air Filter Element Part Number .............. 17231-Z0D-000
| Carburetor Adjustment |
Main Jet .............. #60
Pilot Jet .............. #35
Idle Fuel .............. 2-3/8 turns out
Float Height, in (mm) .............. 0.50 (12.0)
Low Idle Speed, rpm .............. 1550±150
High Idle Speed, rpm .............. 4000±150
| Ignition System |
Spark Plug Type .............. NGK CR5HSB or Denso U16FSR
Spark Plug Gap, in (mm) .............. 0.024-0.028 (0.60-0.70)
Module Air Gap, in (mm) .............. 0.008-0.020 (0.20-0.50)
Ignition Timing, deg .............. 25 BTDC
Spark Plug Torque, Nm (ft-lbs) .............. 12 (9)
| 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
Clean Fuel Strainer .............. Every 100 hours
Check and Adjust Idle Speed .............. Every 200 hours
Check Carburetor Adjustment .............. Every 200 hours
Check and Adjust Valve Clearance .............. Every 200 hours
Replace Spark Plug .............. Every 200 hours
Replace Air Filter Element .............. Every 200 hours
Clean Combustion Chamber .............. Every 300 hours
Clean Fuel Lines .............. Every 300 hours
| Tightening Torques |
Connecting Rod Bolt (M5x0.8) .............. 5 Nm (3.6 ft-lb)
Oil Drain Plug Bolt (M10x1.25) .............. 18 Nm (13 ft-lb)
Valve Adjusting Lock Nut (M5 x0.5) .............. 7.5 Nm (5.4 ft-lb)
Flywheel Nut (M12x1.25) .............. 42 Nm (31 ft-lb)
Governor Arm Nut (M6x1.0) .............. 10 Nm (7 ft-lb)
Air Cleaner Case Bolt (M5x0.8) .............. 7 Nm (5.1 ft-lb)
Air Cleaner Cover Bolt (M6x1.0) .............. 2.3 Nm (1.7 ft-lb)
Spark Plug (M10x1.0) .............. 12 Nm (9 ft-lb)
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