The Honda H4518 is a lawn tractor with small 0.64 l (635 cc, 38.7 cu-in) two-cylinder water-cooled gasoline engine Honda GX640. The Honda H4518H is equipped with hydrostatic transmission and 965 mm (38 in.), 1190 mm (42 in.) or 1,168 mm (46 in) mower deck. The mower deck is adjustable in seven increments for cutting heights between 25 mm (1 in.) and 100 mm (4 in). The Honda H4518 lawn tractor was produced from 1991 through 1998.
The GX640 engine develops 18.0 HP (13.2 kW) at 3,600 rpm and 46.1 Nm (4.7 kg·m, 34.0 ft·lb) of torque at 2,500 rpm. It is a liquid-cooling motor with a 76.0 mm (3.0 in) cylinder bore and a 70.0 mm (2.8 in) stroke, and 8.0:1 compression ratio. The has an OHV design with two valves per cylinder; horizontal type carburetor with a butterfly valve; C.D.I. (Capacitor Discharge Ignition) ignition system, a mechanical centrifugal governor and electric starter.
The hydrostatic transmission. The transmissiom has three approximate ground speeds: Reverse to 3.4 km/h (2.1 mph), Mowing to 5.1 km/h (3.2 mph) and Transport to 7.6 km/h (4.7 mph)
H4518 specifications
| General Specifications | |
| Model | Honda H4518H |
| Length | 1,815 mm (71.5 in) |
| Width | 38 inch deck type: 1,270 mm (50.0 in) 42 inch deck type: 1,460 mm (57.5 in) 46 inch deck type: 1,530 mm (60.2 in) |
| Height | 1,052 mm (41.4 in) |
| Wheel base | 1,190 mm (46.9 in.) |
| Dry weight | 38 inch deck type: 290.0 kg (639.5 lbs) 42 inch deck type: 302.0 kg (655.9 lbs) 46 inch deck type: 304.0 kg (670.3 lbs) |
| Front tires size | 15×6.0-6 |
| Front tires pressure | 98 kPa (1.0 kg/cm2, 14 psi) |
| Rear tires size | 20.5×8.5-10 |
| Rear tires pressure | 79 kPa (0.8 kg/cm2, 11.4 psi) |
| Fuel tank capacity | 9.0 l (2.38 US gal., 1.98 Imp gal.) |
| Battery | 12V-30AH |
| Engine | |
| Engine model | Honda GX630 |
| Displacement | 635 cm3 (38.7 cu-in) |
| Bore x stroke | 76.0 x 70.0 mm (3.0 x 2.8 in.) |
| Max. horsepower | 18.0 HP (13.2 kW) at 3,600 rpm |
| Max. torque | 46.1 Nm (4.7 kg·m, 34.0 ft·lb) at 2,500 rpm |
| Carburetor | Horizontal type, butterfly valve |
| Cooling system | Liquid-cooling |
| Ignition system | CDI ignition |
| Lubricating system | Forced oil by trochoid pump |
| Starting system | Electric starter |
| Stoping system | Cut off the power supply to the CDI (Open) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Spark plug | NGK: BPR5ES-11 NIPPONDENSO: W16EPR-11 |
| Oil type | Honda 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-40 |
| Oil capacity (without filter changed) | 2.0 L (2.11 US qt, 1.76 Imp qt) |
| Oil capacity (with filter changed) | 2.3 L (2.43 US qt, 2.02 Imp qt) |
| Hydrostatic type transmission | |
| Type | Oil pressure-type variable-speed transmission |
| Groung speeds | Reverse: 3.4 km/h (2.1 mph) Mowing: 5.z km/h (3.2 mph) Transport: 7.6 km/h (4.7 mph) |
| Mower Deck | |
| Deck size | 965 mm (38 in.), 1,060 mm (42 in.) or 1,168 (46 in.) |
| Height range | 25-100 mm (1-4 in.) |
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