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Home / Small Engines / Honda Engines / Honda GCV135

Honda GCV135 Specifications

Engine Model: Honda GCV135

Engine Type: 4-cycle OHC 1-cylinder gasoline engine

Total Displacement: 8.2 cu.in (135 cc)

Rated Engine Power: 4.5 Hp (3.3 kW) at 3600 rpm

Carburetor Type: Horizontal, butterfly valve

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General Technical Data

Engine Model .............. Honda GCV135
Engine Type .............. 4-cycle overhead camshaft 1-cylinder air-cooled small gasoline engine
Number of Cylinders .............. Single
Displacement, cu.in (cc) .............. 8.20 (135)
Cylinder Bore, in (mm) .............. 2.53 (64.0)
Piston Stroke, in (mm) .............. 1.67 (42.0)
Rated Engine Power, hp (kW) .............. 4.5 (3.3)
Rated Engine Speed, rpm .............. 3600
Maximum Torque, Nm (ft-lbs) .............. 9.7 (7.2)
Torque Speed, rpm .............. 2500
Compression Ratio .............. 8.5:1
PTO Shaft Rotation .............. Counterclockwise (from PTO shaft side)
Valve Arrangement .............. OHC
Lubrication System .............. Splash type
Air Cleaner .............. Dry type
Cooling System .............. Forced air
Ignition System .............. Transistorized magneto
Starter Type .............. Recoil

Fuel System

Fuel System Type .............. Carburetor
Carburetor Type .............. Horizontal with butterfly valve
Governor Type .............. Centrifugal mechanical
Fuel Tank Capacity, qts (L) .............. 1.0 (0.9)
Fuel Type .............. Gasoline (86 or higher)

Dimensions and Weight

Overall Length, in (mm) .............. 13.8 (351)
Overall Width, in (mm) .............. 13.0 (331)
Overall Height, in (mm) .............. 13.9 (353)
Dry Weight, lbs (kg) .............. 20.9 (9.5)

Cylinder Block

Cylinder Bore Inside Diameter (Std), in (mm) .............. 2.52 (64.0)
Cylinder Bore Inside Diameter (Wear Limit), in (mm) .............. 2.5262 (64.165)
Connecting Rod Small End Inside Diameter (Std), in (mm) .............. 0.5120 (13.005)
Connecting Rod Small End Inside Diameter (Wear Limit), in (mm) .............. 0.515 (13.07)
Connecting Rod Big End Inside Diameter (Std), in (mm) .............. 1.024 (26.02)
Connecting Rod Big End Inside Diameter (Wear Limit), in (mm) .............. 1.0262 (26.066)
Connecting Rod Big End Oil Clearance, in (mm) .............. 0.0016-0.0025 (0.040-0.063)
Crankshaft Main Journal Outside Diameter (PTO), in (mm) .............. 1.1021 (27.993)
Crankshaft Main Journal Outside Diameter (Flywheel), in (mm) .............. 0.9997 (25.393)
Crank Pin Outside Diameter, in (mm) .............. 1.023 (25.98)
Cam Height, in (mm) .............. 1.4722 (37.394)
Rocker Arm Inside Diameter (Std), in (mm) .............. 0.2362 (6.00)
Rocker Arm Inside Diameter (Wear Limit), in (mm) .............. 0.2379 (6.043)
Rocker Arm Shaft Outside Diameter (Std), in (mm) .............. 0.2358 (5.99)
Rocker Arm Shaft Outside Diameter (Wear Limit), in (mm) .............. 0.2344 (5.953)
Rocker Arm Shaft Bearing Inside Diameter (Std), in (mm) .............. 0.2362 (6.00)
Rocker Arm Shaft Bearing Inside Diameter (Wear Limit), in (mm) .............. 0.2379 (6.043)

Cylinder Head and Valves

Number of Valves .............. 2
Cylinder Head (Max Out of Flatness), in (mm) .............. 0.002 (0.05)
Intake Valve Clearance, in (mm) .............. 0.006±0.002 (0.15±0.04)
Exhaust Valve Clearance, in (mm) .............. 0.008±0.002 (0.20±0.04)
Intake Valve Stem Outside Diameter (Std), in (mm) .............. 0.216 (5.48)
Intake Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.2094 (5.318)
Exhaust Valve Stem Outside Diameter (Std), in (mm) .............. 0.214 (5.44)
Exhaust Valve Stem Outside Diameter (Wear Limit), in (mm) .............. 0.2077 (5.275)
Valve Guide Inside Diameter (Intake/Exhaust), in (mm) .............. 0.217 (5.50)
Valve Seat Width (Intake/Exhaust), in (mm) .............. 0.028 (0.70)
Valve Spring Free Length, in (mm) .............. 1.34 (34.00)
Intake Valve Head Diameter, in (mm) .............. 0.98 (25.00)
Exhaust Valve Head Diameter, in (mm) .............. 0.94 (24.00)

Piston and Piston Rings

Piston Pin Bore Inside Diameter (Std), in (mm) .............. 0.5119 (13.002)
Piston Pin Bore Inside Diameter (Wear Limit), in (mm) .............. 0.5137 (13.048)
Piston Skirt Outside Diameter, in (mm) .............. 2.5185 (63.969)
Piston to Cylinder Bore Clearance, in (mm) .............. 0.0012-0.0028 (0.031-0.070)
Piston Pin Outside Diameter (Std), in (mm) .............. 0.5118 (13.000)
Piston Pin Outside Diameter (Wear Limit), in (mm) .............. 0.5100 (12.954)
Top Ring Width, in (mm) .............. 0.06 (1.50)
Second Ring Width, in (mm) .............. 0.06 (1.50)
Oil Ring Width, in (mm) .............. 0.10 (2.50)
Top Ring Groove Side Clearance, in (mm) .............. 0.0006-0.0018 (0.015-0.045)
Second Ring Groove Side Clearance, in (mm) .............. 0.0006-0.0018 (0.015-0.045)
Oil Ring Groove Side Clearance, in (mm) .............. 0.0006-0.0018 (0.015-0.045)
Top Ring End Gap, in (mm) .............. 0.008-0.014 (0.20-0.35)
Second Ring End Gap, in (mm) .............. 0.012-0.018 (0.30-0.45)
Oil Ring End Gap, in (mm) .............. 0.006-0.014 (0.15-0.35)
Ring End Gap (Wear Limit), in (mm) .............. 0.04 (1.00)

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