Yamaha MA190

Yamaha MA190The Yamaha MA190 is a 189 cc (11.5 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with vertical shaft manufactured by Yamaha Motor Co., Ltd.

The Yamaha MA190 engine has a low-profile OHC (overhead cam) system with steel chain drive for optimized engine size and durability; hemispherical head with angled intake/exhaust valves; cast-iron cylinder line; float type carburetor; transistorized ignition system (T.C.I.).

The cylinder bore is 68.0 mm (2.67 in) and the piston stroke is 52.0 mm (2.05 in), compression ratio rating is 8.5:1. The engine produced 5.0 PS (3.7 kW) at 3,600 rpm of maximum horsepower. Maximum torque is 11.2 N·m (1.14 kg·m, 8.26 ft·lb) at 2,400 rpm.

General information

Engine Specifications
ModelMA190
Type4-stroke, OHV, single cylinder
Displacement189 cm 3 (11.5 cu-in)
Max. horsepower5.0 PS (3.7 kW) at 3,600 rpm
Max. torque (crank PTO)11.2 N·m (1.14 kg·m, 8.26 ft·lb) at 2,400 rpm
CarburetorFloat type
Cooling systemForced-air
Ignition systemTransitorized (T.C.I.)
Lubricating systemMechanical splashing
Starting systemRecoil
Fuel usedUnleaded gasoline (octane number 86 or higher)
Fuel tank capacity1.2 L
PTO shaft rotationCounterclockwise (from PTO shaft side)

Dimensions and Weight

Yamaha MA190
Length, mm (in)425 (16.7)
Width, mm (in)360 (14.2)
Height, mm (in)270 (10.6)
Dry weight, kg (lb)14.0 (30.9)

Service Information

Oil system
Oil typeYamalube 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30, 10W-40
Oil capacity0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Spark plugNGK: BPR7HS
Spark plug gap0.7-0.8 mm (0.028-0.031 in)
Spark plug tightening torque20 N·m (2.0 kg·m, 14 ft·lb)
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