The Honda HA4120 is a 2WD lawn tractor manufactured by John Deere for distributor Honda in Horicon, Wisconsin, USA from 1998 to 2001. The Honda HA4120 is equipped with a 0.6 L (37.5 cu·in) two-cylinder gasoline engine and a hydrostatic transmission with infinite forward and reverse gears.
The Honda HA4120 lawn tractor used the Honda GXV610 engine. It is a 0.6 L, 614 cm2, (37.5 cu·in) two-cylinder natural aspirated gasoline engine with 77.0 mm (3.03 in) of the cylinder bore and 66.0 mm (2.6 in) of the piston stroke. The compression ratio rating is 8.3:1. This engine produced 20.3 PS (14.9 kW; 20.0 HP) at 3,600 rpm of output power.
The Honda HA4120 is equipped with an open operator station, 9.5 liters (2.5 US gal.; 2.1 Imp. gal) fuel tank, and a mid-mount 1,210 mm (48 in) mower deck with 3-blades.
Honda HA4120 Specifications
| General Specifications | |
| Model | Honda HA4120 |
| Length | 1,730 mm (68.1 in) |
| Width | 1,500 mm (59.1 in) |
| Height | 1,030 mm (40.6 in) |
| Wheel base | 1,160 mm (45.7 in) |
| Weight | 253 kg (558 lbs) |
| Fuel tank capacity | 9.5 liters (2.5 US gal.; 2.1 Imp. gal) |
| Battery | 12V |
| Cabin type | Open operator station |
| Engine | |
| Engine model | Honda GXV610 |
| Engine type | Four-stroke, air-cooled, V-twin |
| Cylinders | 2 |
| Fuel type | Gasoline |
| Displacement | 0.6 L, 614 cm2, (37.5 cu·in) |
| Bore and stroke | 77.0 mm X 66.0 mm (3.03 in X 2.6 in) |
| Compression ratio | 8.3:1 |
| Horsepower | 20.3 PS (14.9 kW; 20.0 HP) at 3,600 rpm |
| Starter | Electric |
| Oil type | SAE 10W-30 |
| Oil capacity: | 2.2 L (2.3 US. qt, 1.9 Imp. qt.) |
| Spark plug | NGK BPR5ES |
| Transmission and chassis | |
| Chassis | 4×2 2WD |
| Steering type | – |
| Brakes | – |
| Transmission model | Tuff Torq K61 |
| Transmission type | Hydrostatic |
| Gears | Infinite forward and reverse |
| Speed | Forward: 8.0 kmh (5 mph) Reverse: 3.9 (2.4 mph) |
| Transmission oil capacity | 3.4 L (0.9 US. gal, 0.7 Imp. gal.) |
| Tires | |
| Front tires | Lawn/turf: 15×6.00-6 |
| Rear tires | Lawn/turf: 20×10.00-8 |

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