Yamaha MZ250

Yamaha MZ250The Yamaha MZ250 is a 253 cc (15.4 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 MZ250 engine has an OHV (overhead valve) design; float type carburetor; centrifugal flyweight governor; mechanical splashing lubrication system; Transistor Controlled Ignition (T.C.I.) and recoil or electrical (option) starter. The Yamaha MZ250 used aluminum cylinder block with a spiny cast-iron sleeve. For exhaust valve used high heat resistant SUH3 steel.

The cylinder bore is 74.0 mm (2.91 in) and the piston stroke is 59.0 mm (2.32 in), compression ratio rating is 8.7:1. The engine produced 7.3 PS (5.4 kW) at 3,600 rpm of maximum horsepower and 6.1 PS (4.5 kW) at 3,600 rpm of continuous rated power. Maximum torque is 15.7 N·m (1.60 kg·m, 11.6 ft·lb) at 2,400 rpm.

General information

Engine Specifications
ModelMZ250
Type4-stroke, OHV, single cylinder
Displacement253 cm 3 (15.4 cu-in)
Max. horsepower7.3 PS (5.4 kW) at 3,600 rpm
Max. torque (crank PTO)15.7 N·m (1.60 kg·m, 11.6 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 MZ250
Length, mm (in)362 (14.2)
Width, mm (in)426 (16.7)
Height, mm (in)427 (16.8)
Dry weight, kg (lb)26.0 (57.3)

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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