The Honda GCV135 is a small (135 cc) single-cylinder air-cooled 4-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 mm (2.5 in) cylinder bore and 42 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. It produces 3.3 kW (4.5 HP) at 3,600 rpm and 9.7 N·m (0.99 kg·m, 7.2 ft·lb) of torque at 2,500 rpm.
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 HP (3.3 kW) at 3,600 rpm
Max. torque (crank PTO)
9.7 N·m (0.99 kg·m, 7.2 ft·lb) at 2,500 rpm
Carburetor
Horizontal type, butterfly valve
Cooling system
Forced-air
Ignition system
Transistorized magneto ignition
Lubricating system
Splash
Starting system
Recoil starter
Stoping system
Ignition primary circuit ground
Fuel used
Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity
0.9 l (0.24 US. Gal, 0.20 Imp. Gal.)
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 mm X 42 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
Ring side clearance
Top/second/oil
0.015-0.045 mm (0.0006-0.0018 in)
Ring end gap
Top
0.20-0.35 mm (0.008-0.014 in)
Second
0.30-0.45 mm (0.012-0.018 in)
Oil
0.15-0.35 mm (0.006-0.014 in)
Ring width
Top/second
1.5 mm (0.06 in)
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
Stem outer diameter (standard):
INTAKE
5.480 mm (0.216 in)
EXHAUST
5.44 mm (0.214 in)
Guide internal diameter
INTAKE / EXHAUST
5.5 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 (0.006 ± 0.002)
Exhaust valve
0.20 ± 0.04 (0.008 ± 0.002)
Oil system
Oil type
Honda 4-stroke or an equivalent (SE or SF)
Recommended oil
SAE 10W-30
Oil capacity
0.55 l (0.58 US. qt, 0.48 Imp. qt.)
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 kΩ
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:Sergei WersAbout: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.
6 Comments
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…..
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
The Honda GCV135 is a small (135 cc) single-cylinder air-cooled 4-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.
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