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| Home / Small Engines / Honda Engines / Honda G100 |
Honda G100 Maintenance
| Engine Model: Honda G100 |
| Engine Type: 4-cycle 1-cylinder air-cooled gasoline engine |
| Displacement (K1/K2): 5.1 cu.in (83 cc) / 6 cu.in (98 cc) |
| Engine Power (K1/K2): 2.2 Hp (1.6 kW) / 2.5 Hp (1.9 kW) |
| Carburetor Type: Horizontal, butterfly valve |
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| Service Data |
Cylinder Compression, psi (kPa) .............. 92.5 (637)
Cylinder Bore Inside Diameter (G100K1, Max), in (mm) .............. 1.8985 (48.055)
Cylinder Bore Inside Diameter (G100K2, Max), in (mm) .............. 2.0577 (52.060)
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.004 (0.10)
Intake Valve Clearance, in (mm) .............. 0.0031-0.0063 (0.08-0.16)
Exhaust Valve Clearance, in (mm) .............. 0.0031-0.0063 (0.08-0.16)
| Engine Oil and Filters |
Engine Oil Type (Summer) .............. SAE 10W-30, 10W-40
Engine Oil Type (Winter) .............. SAE 10W
API Service Classifications .............. SJ
Oil Capacity, qts (L) .............. 0.48 (0.45)
Air Filter (Element) Part Number .............. 17211-896-000
Fuel Filter Part Number .............. 17672-880-000
| Carburetor Adjustment |
Main Jet .............. #62
Idle Fuel .............. 2 turns out
Float Height, in (mm) .............. 0.42-0.53 (10.7-13.3)
Low Idle Speed, rpm .............. 1400±100
High Idle Speed, rpm .............. 3850±100
| Ignition System |
Spark Plug Type .............. NGK BM4A, BMR4A
Spark Plug Gap, in (mm) .............. 0.0236-0.0276 (0.60-0.70)
Module Air Gap, in (mm) .............. 0.008-0.024 (0.20-0.60)
Ignition Timing, deg .............. 20 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
Check and Adjust Spark Plug .............. Every 50 hours
Change Engine Oil .............. Every 100 hours
Clean Fuel Filter .............. Every 100 hours
Replace Spark Plug .............. Every 100 hours
Replace Air Filter Element .............. Every 200 hours
Check Carburetor Adjustment .............. Every 200 hours
Check and Adjust Idle Speed .............. Every 200 hours
Clean Fuel Strainer .............. Every 300 hours
Check and Adjust Valve Clearance .............. Every 300 hours
Replace Fuel Lines .............. Every 500 hours
| Tightening Torques |
Carburetor, Nm (ft-lb) .............. 4-6 (2.9-4.3)
Flywheel Nut, Nm (ft-lb) .............. 45-55 (32.5-40)
Governor Arm Nut, Nm (ft-lb) .............. 8-12 (5.8-8.7)
Cylinder Head Cover Bolt, Nm (ft-lb) .............. 8-12 (5.8-8.7)
Crankcase Cover, Nm (ft-lb) .............. 8-12 (5.8-8.7)
Connecting Rod Bolt, Nm (ft-lb) .............. 4-6 (2.9-4.3)
Spark Plug, Nm (ft-lb) .............. 18-20 (12-14)
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