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Honda GC135 Maintenance
| Engine Model: Honda GC135 |
| Engine Type: 4-cycle overhead camshaft 1-cylinder air-cooled gasoline engine |
| Total Displacement: 8.2 cu.in (135 cc) |
| Rated Engine Power: 4 Hp (2.9 kW) at 3600 rpm |
| Fuel System: Horizontal carburetor with butterfly valve |
Cylinder Bore Inside Diameter (Maximum), in (mm) .............. 2.562 (64.165)
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.002 (0.05)
Intake Valve Clearance, in (mm) .............. 0.006 (0.015)
Exhaust Valve Clearance, in (mm) .............. 0.008 (0.020)
Engine Oil Type (Summer) .............. SAE 10W-30, 10W-40
Engine Oil Type (Winter) .............. SAE 5W-30
API Service Classifications .............. SJ or higher
Oil Capacity, qts (L) .............. 0.61 (0.58)
Air Filter Element Part Number .............. 17211-ZL8-023
Main Jet .............. #60
Idle Fuel .............. 2 turns out
Float Height, in (mm) .............. 0.42-0.53 (10.7-13.3)
Low Idle Speed, rpm .............. 1400±150
High Idle Speed, rpm .............. 3850±150
Spark Plug Type .............. NGK BPR6ES
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 .............. 20 BTDC
Spark Plug Torque, Nm (ft-lbs) .............. 20 (14)
Check Engine Oil Level .............. Every 10 hours
Clean Air Filter Element .............. Every 25 hours
Change Engine Oil .............. Every 50 hours
Check and Adjust Spark Plug .............. Every 100 hours
Check Carburetor Adjustment .............. Every 100 hours
Check and Adjust Idle Speed .............. Every 100 hours
Clean Fuel Strainer .............. Every 100 hours
Check and Adjust Valve Clearance .............. Every 100 hours
Replace Spark Plug .............. Every 250 hours
Replace Air Filter Element .............. Every 250 hours
Clean Combustion Chamber .............. Every 250 hours
Clean Fuel Lines .............. Every 250 hours
Crankcase Cover (M6x1.0) .............. 12 Nm (9 ft-lb)
Connecting Rod Bolt (M7x1.0) .............. 12 Nm (9 ft-lb)
Valve Adjusting Lock Nut (M5x0.5) .............. 8 Nm (5.8 ft-lb)
Cylinder Head Cover Bolt (M6x1.0) .............. 12 Nm (9 ft-lb)
Oil Drain Plug Bolt (M12x1.5) .............. 24 Nm (17 ft-lb)
Flywheel Nut (M14x1.5) .............. 52 Nm (38 ft-lb)
Governor Arm Nut (M6x1.0) .............. 10 Nm (7 ft-lb)
Breather Cover Bolt (M6x1.0) .............. 12 Nm (9 ft-lb)
Air Cleaner Case Bolt (M6x1.0) .............. 10 Nm (7 ft-lb)
Muffler Bolt (M6x1.0) .............. 12 Nm (9 ft-lb)
Recoil Starter Nut (M6x1.0) .............. 8.5 Nm (6.1 ft-lb)
Fan Cover Stud Bolt (M6x1.0) .............. 12 Nm (9 ft-lb)
Fuel Pump Screw (M5x0.8) .............. 3 Nm (2.2 ft-lb)
Oil Level Switch Bolt (M6x1.0) .............. 12 Nm (9 ft-lb)
Oil Filler Extension Bolt (M6x1.0) .............. 12 Nm (9 ft-lb)
Spark Plug (M14x1.25) .............. 20 Nm (14 ft-lb)
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