Yamaha MX250

Yamaha MX250The 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
ModelMX250
Type4-stroke, Hemi-head OHV, single cylinder
Displacement296 cm 3 (18.0 cu-in)
Max. horsepower8.7 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
CarburetorFloat type
Cooling systemForced-air
Ignition systemTransistor Controlled Ignition (T.C.I.)
Lubricating systemMechanical splashing
Starting systemRecoil or Electrical (option)
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity5.5 L (1.45 US Gal, 1.21 Imp Gal.)
PTO shaft rotationCounterclockwise (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 clearance0.10 mm (0.004 in)
Exhaust valve clearance0.10 mm (0.004 in)
Oil system
Oil typeYamalube 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30, 10W-40
Oil capacity1.0 L (1.06 US. qt, 0.88 Imp. qt.)
Ignition system
Spark plugNGK: BPR4ES
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
T.C.I. air gap0.4 ± 0.2 (0.016 ± 0.008)
Spark plug tightening torque20 N·m (2.0 kg·m, 14 ft·lb)
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We try to use verified sources and official documentation, however, differences between sources or errors in entering information may occur. We do not provide advice on technical issues related to the engines operation or repair. We do not recommend using provided information for engines repairing engines or spare parts ordering, use only official service manuals and spare-parts catalogs.

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