The Honda GCV135 is an 135 cc (8.2 cu-in) single-cylinder, air-cooled, four-stroke internal combustion gasoline engine with vertical shaft, manufactured by Honda Motor Company since 1997 for general-purpose applications such as: pressure washers, lawn mowers, agricultural equipment, forestry equipment.
This engine has a single-cylinder, compact combustion chamber, tough resin overhead cam for durability and quietness and uniblock construction reduce fuel consumption. The Honda GCV135 engine has transistorized magneto ignition, horizontal type carburetor, and recoil starter.
A 64.0 mm (2.5 in) cylinder bore and 42.0 mm (1.7 in) piston stroke give the engine a total of 135 cc (8.2 cu-in) of displacement. Compression ratio rating is 8.5:1.
This engine produces 4.5 PS (3.3 KW; 4.5 HP) at 3,600 rpm of maximum horsepower and 9.7 Nm (0.99 kg·m; 7.16 lbf·ft) at 2,500 rpm of peak torque.
General information
| Engine Specifications | |
| Model | GCV135 (vertical shaft) |
| Type | 4-stroke, OHC, single cylinder |
| Displacement | 135 cm 3 (8.2 cu-in) |
| Max. horsepower | 4.5 PS (3.3 KW; 4.5 HP) at 3,600 rpm |
| Max. torque (crank PTO) | 9.7 Nm (0.99 kg·m; 7.16 lbf·ft) at 2,500 rpm |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition |
| Lubricating system | Splash type |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 0.9 liters (0.95 US.qts, 0.79 Imp. qts) |
| Fuel consumption | 230 g/HPh |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| N1 | N2 | N3 | N4 | |
| Length, mm (in) | 351 (13.8) | |||
| Width, mm (in) | 331 (13.0) | |||
| Height, mm (in) | 353 (13.9) | 340 (13.4) | 358 (14.1) | 340 (13.4) |
| Dry weight, kg (lb) | 9.5 (20.9) | |||
| Operating weight, kg (lb) | 10.8 (23.8) | |||
Cylinder Block and Head
| Cylinder block | ||
| Compression ratio: | 8.5:1 | |
| Bore x Stroke | 64.0 mm X 42.0 mm (2.5 x 1.7 in) | |
| Sleeve internal diameter | 64.00 mm (2.52 in) | |
| Piston skirt outer diameter | 63.969 mm (2.5185 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Piston ring side clearance (Top): | 0.015-0.045 mm (0.0006-0.0018 in) | |
| Piston ring side clearance (Second): | 0.015-0.045 mm (0.0006-0.0018 in) | |
| Piston ring side clearance (Oil): | 0.015-0.045 mm (0.0006-0.0018 in) | |
| Piston ring end gap (Top): | 0.200-0.350 mm (0.008-0.014 in) | |
| Piston ring end gap (Second): | 0.300-0.450 mm (0.012-0.018 in) | |
| Piston ring end gap (Oil): | 0.150-0.350 mm (0.006-0.014 in) | |
| Ring width (Top): | 1.5 mm (0.06 in) | |
| Ring width (Second): | 1.5 mm (0.06 in) | |
| Ring width (Oil): | 2.5 mm (0.10 in) | |
| Connecting rod small end ID | 13.005 mm (0.512 in) | |
| Connecting rod big end ID | 26.02 mm (1.024 in) | |
| Crankpin outer diameter | 25.98 mm (1.023 in) | |
| Main journal outer diameter | PTO side: 27.993 mm (1.1021 in) Flywheel side: 25.393 mm (0.9997 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | OHC | |
| Valves: | 2 | |
| Valve stem outer diameter (INTAKE): | 5.480 mm (0.216 in) | |
| Valve stem outer diameter (EXHAUST): | 5.440 mm (0.214 in) | |
| Valve guide inner diameter (INTAKE): | 5.500 mm (0.2165 in) | |
| Valve guide inner diameter (EXHAUST): | 5.500 mm (0.2165 in) | |
| Spring free length | 34.0 mm (1.34 in) | |
Tightening torque specs
| Tightening torque specs | |
| Air cleaner case bolt | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Connecting rod bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Valve adjusting lock nut | 8 Nm; 0.8 kg·m; 5.8 ft·lb |
| Cylinder head cover bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Oil drain plug bolt | 24 Nm; 2.4 kg·m; 17 ft·lb |
| Flywheel nut | 52 Nm; 5.3 kg·m; 38 ft·lb |
| Governor arm nut | 10 Nm; 1.0 kg·m; 7 ft·lb |
| Muffler bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Recoil starter nut | 8.5 Nm; 0.85 kg·m; 6.1 ft·lb |
| Fan cover stud bolt | 12 Nm; 1.2 kg·m; 8.6 ft·lb |
| Spark plug | 20 Nm; 2.0 kg·m; 14 ft·lb |
| Others | |
| 5 mm bolts, nuts | 5.5 Nm; 0.55 kg·m; 4.0 ft·lb |
| 6 mm bolts, nuts | 10 Nm; 1.0 kg·m; 7 ft·lb |
| 8 mm bolts, nuts | 24 Nm; 2.4 kg·m; 17 ft·lb |
| 10 mm bolts, nuts | 37 Nm; 3.7 kg·m; 27 ft·lb |
| 12 mm bolts, nuts | 55 Nm; 5.5 kg·m; 39.5 ft·lb |
Service Information
| Engine | |
| Maximum speed | 3,000 ± 150 rpm |
| Idle speed | 1,700 ± 150 rpm |
| Cylinder compression | 5.0 kg/cm2 (71 psi) at 600 rpm |
| Valve clearance | |
| Intake valve | 0.15 ± 0.04 mm (0.006 ± 0.002 in) |
| Exhaust valve | 0.20 ± 0.04 mm (0.008 ± 0.002 in) |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.55 liters (0.58 US.qts, 0.48 Imp. qts) |
| Ignition system | |
| Ignition timing | 20° B.T.D.C. |
| Spark plug | NGK: BPR6ES |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| Spark plug tightening torque | 20 Nm; 2.0 kg·m; 14 ft·lb |
| Primary ignition coil resistance | 1.0-1.2 Ω |
| Secondary ignition coil resistance | 10.6-12.8 kΩ |
| Ignition coil air gap | 0.2-0.6 mm (0.008-0.024 in) |
| Carburetor | |
| Main jet | #60 |
| Float height | 9.2 mm (0.36 in) |
| Pilot screw opening | 1-5/8 turns out |
Author:
The circular white disc on the side of the engine – is it necessary – mine has fallen off – can’t get it on again …..info required please…..
혼다 gcv135 엔진을 구매할수없나요
Hello, I am looking for a carburetor (GB641NB22) for Honda lawn mower GCV135. It’s price plus shipping to Nakuru, Kenya
the ignition coil spect aren’t correct the primary resistence is about 1.0-1.2 Ω, not kΩ !
pls can i use nitrous in my engine pls i need more power and free nitrous
My Delta 220 psi high pressure washer. It’s powered by Honda 4.5 small gas engine. I don’t have owners manual an need to know the type and quantity of oil to put in it. This engine runs great. However, I’m concerned about the 2200 psi pump. Should I be changing the oil (need type and quantity)in the pump or leave that to pump speacialist