The Yamaha MX250 is a 296 cc (18.0 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with horizontal shaft manufactured by Yamaha Motor Co., Ltd.
The Yamaha MX250 engine has a hemispherical combustion chamber with V-valve layout; float type carburetor; centrifugal flyweight governor; mechanical splashing lubrication system; Transistor Controlled Ignition (T.C.I.) and recoil or electrical (option) starter. The starter knob position can be adjusted by each 45°. Microwave harden crankshaft and camshaft provide extremely long life. The high-tech exhaust valve (Stellite® coated and tufftride® finished) resists very high temperature.
The cylinder bore is 80.0 mm (3.15 in) and the piston stroke is 59.0 mm (2.32 in), compression ratio rating is 8.4:1. The engine produced 8.7 PS (6.4 kW) at 3,600 rpm of maximum horsepower and 7.2 PS (5.3 kW) at 3,600 rpm of continuous rated power. Maximum torque is 19.7 N·m (2.01 kg·m, 14.5 ft·lb) at 2,400 rpm.
General information
| Engine Specifications | |
| Model | MX250 |
| Type | 4-stroke, Hemi-head OHV, single cylinder |
| Displacement | 296 cm 3 (18.0 cu-in) |
| Max. horsepower | 8.7 PS (6.4 kW) at 3,600 rpm |
| Max. torque (crank PTO) | 19.7 N·m (2.01 kg·m, 14.5 ft·lb) at 2,400 rpm |
| Carburetor | Float type |
| Cooling system | Forced-air |
| Ignition system | Transistor Controlled Ignition (T.C.I.) |
| Lubricating system | Mechanical splashing |
| Starting system | Recoil or Electrical (option) |
| Fuel used | Unleaded gasoline (octane number 86 or higher) |
| Fuel tank capacity | 5.5 L (1.45 US Gal, 1.21 Imp Gal.) |
| PTO shaft rotation | Counterclockwise (from PTO shaft side) |
Dimensions and Weight
| Yamaha MX250 | |
| Length, mm (in) | 390 (15.3) |
| Width, mm (in) | 444 (17.5) |
| Height, mm (in) | 451 (17.7) |
| Dry weight, kg (lb) | 26.5 (58.4) |
Service Information
| Valve clearance | |
| Intake valve clearance | 0.10 mm (0.004 in) |
| Exhaust valve clearance | 0.10 mm (0.004 in) |
| Oil system | |
| Oil type | Yamalube 4-stroke or an equivalent (SE or SF) |
| Recommended oil | SAE 10W-30, 10W-40 |
| Oil capacity | 1.0 L (1.06 US. qt, 0.88 Imp. qt.) |
| Ignition system | |
| Spark plug | NGK: BPR4ES |
| Spark plug gap | 0.7-0.8 mm (0.028-0.031 in) |
| T.C.I. air gap | 0.4 ± 0.2 (0.016 ± 0.008) |
| Spark plug tightening torque | 20 N·m (2.0 kg·m, 14 ft·lb) |
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