The Honda GV150 is a 144 cc (8.8 cu.in.) single-cylinder air-coolled four-stroke internal combustion small gasoline engine with vertical shaft manufactured by Honda Motor Company.
This engine has a side-valve design with camshaft driven by a timing chain. It has a recoil starter, horizontal butterfly type carburetor, flywheel magneto or CDI ignition system.
The cylinder bore is 64.0 mm (2.5 in) and the piston stroke is 45.0 mm (1.8 in). Compression ratio rating is 6.3:1. The Honda GV150 motor produced 3.5 HP (2.6 kW) at 3600 rpm of horsepower and 7.0 Nm (0.71 kg·m, 5.1 ft·lb) at 3500 rpm of torque.
General information
| Engine Specifications | |
| Model | GV150 K1 |
| Type | 4-stroke, side valve, single cylinder |
| Displacement | 144 cm 3 (8.8 cu-in) |
| Max. horsepower | 3.5 HP (2.6 kW) at 3600 rpm |
| Max. torque | 7.0 Nm (0.71 kg·m, 5.1 ft·lb) at 3500 |
| Carburetor | Horizontal type butterfly valve |
| Cooling system | Forced-air |
| Ignition system | Transistorized magneto ignition or CDI |
| Lubricating system | Trochoid oil pump |
| Starting system | Recoil starter |
| Stoping system | Ignition primary circuit ground |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 1.0 L (1.27 US pt, 1.06 lmp pt) |
| Fuel consumption | 421 g/kWh (310 g/HPh, 0.68 lb/HPh) |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Cylinder Block and Head
The piston has two compression rings and one oil ring. Precision camshaft design offers precise valve timing and optimal valve overlap for better fuel efficiency.
| Cylinder block | ||
| Compression ratio: | 6.3:1 | |
| Bore x Stroke | 64 X 45 mm (2.5 x 1.8 in) | |
| Sleeve internal diameter | 64.00 mm (2.520 in) | |
| Piston skirt outer diameter | 63.99 mm (2.519 in) | |
| Number of piston rings (compression / oil): | 2 / 1 | |
| Ring side clearance | Top | 0.01-0.05 mm (0.0004-0.0020 in) |
| Second/oil | 0.01-0.05 mm (0.0004-0.0020 in) | |
| Ring end gap | Top/second | 0.20-0.40 mm (0.008-0.016 in) |
| Oil | 0.20-0.40 mm (0.008-0.016 in) | |
| Connecting rod small end ID | 15.005-15.020 mm (0.5907-0.5913 in) | |
| Crankshaft crank pin outer diameter | 26.980 mm (1.0622 in) | |
| Cylinder Head | ||
| Warpage (limit) | 0.10 mm (0.004 in) | |
| Valve Arrangement: | Side valve (L-head) | |
| Valves: | 2 | |
| Stem outer diameter (standard): | INTAKE | 6.955-6.970 mm (0.2738-0.2744 in) |
| EXHAUST | 6.910-6.925 mm (0.2720-0.2726 in) | |
| Cam height: | INTAKE | 29.18 mm (1.149 in) |
| EXHAUST | 29.18 mm (1.149 in) | |
| Valve spring free length: | 36.7 mm (1.45 in) | |
MAINTENANCE DATA
| Engine | |
| Idle speed | 1700 ± 150 rpm |
| Cylinder compression | 5.0 kg/cm2 at 600 rpm |
| Valve clearance | |
| Intake valve | 0.08-0.16 mm (0.003-0.006 in) |
| Exhaust valve | 0.16-0.24 mm (0.006-0.009 in) |
| Carburetor | |
| Main jet | #65 |
| Float height | 6.7-9.7 mm (0.26-0.38 in) |
| Pilot screw opening | 2-1/8 turns |
| Oil system | |
| Oil type | Honda 4-stroke or an equivalent (SG.SF/CC.CD) |
| Recommended oil | SAE 10W-30 |
| Oil capacity | 0.6 L (1.27 US pt, 1.06 lmp pt) |
| Ignition system | |
| Ignition timing | 20 ° B.T.D.C (Fixed) |
| Spark plug | Flywheel magneto type: NGK: BM6A, BMR6A CDI: NGK: BPM6A, BPMR6A |
| Spark plug gap | Flywheel magneto type: 0.6-0.7 mm (0.024-0.028 in) CDI: 0.9-1.0 mm (0.035-0.039 in) |
Tightening torque specs
| Tightening torque specs | |
| Drain screw (20 mm bolt) | 40-50 Nm; 4.0-5.0 kg·m; 29-36 ft·lb |
| Drain screw (12 mm bolt) | 15-25 Nm; 1.5-2.5 kg·m; 11-18 ft·lb |
| Flywheel (14 mm nut) | 70-80 Nm; 7.8-8.0 kg·m; 51-58 ft·lb |
| Ignition coil (6 mm) | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Cylinder head (8 mm bolt) | 24-26 Nm; 2.4-2.6 kg·m; 17-19 ft·lb |
| Fan cover | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Connecting rod lower cap (7 mm bolt) | 11-13 Nm; 1.1-1.3 kg·m; 8.0-9.4 ft·lb |
| Oil pan | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Side plate | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Tappet cover | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| Air cleaner case | 7-10 Nm; 0.7-1.0 kg·m; 5.1-7.2 ft·lb |
| Muffler | 13-17 Nm; 1.3-1.7 kg·m; 9.4-12 ft·lb |
| Others | |
| 5 mm bolts, nuts | 4-7 Nm; 0.4-0.7 kg·m; 2.9-5.1 ft·lb |
| 6 mm bolts, nuts | 8-12 Nm; 0.8-1.2 kg·m; 5.8-8.7 ft·lb |
| 8 mm bolts, nuts | 20-28 Nm; 2.0-2.8 kg·m; 14.5-20.3 ft·lb |
| 10 mm bolts, nuts | 35-40 Nm; 3.5-4.0 kg·m; 25-29 ft·lb |
Author:
How do I read the dipstick on my Honda GV150 3.5 horse power gas mower engine. There seems to be no indicator for the full level.
I don’t know if my first message was sent so I am sending a second message. “How to I read the dipstick on my GV150 3.5 Honda mower engine? I cannot see any specific marking at the end of the dipstick to make sure I am putting enough oil in the engine.”