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
Model MA190
Type 4-stroke, OHV, single cylinder
Displacement 189 cm 3 (11.5 cu-in)
Max. horsepower 5.0 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
Carburetor Float type
Cooling system Forced-air
Ignition system Transitorized (T.C.I.)
Lubricating system Mechanical splashing
Starting system Recoil
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 1.2 L
PTO shaft rotation Counterclockwise (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 type Yamalube 4-stroke or an equivalent (SE or SF)
Recommended oil SAE 10W-30, 10W-40
Oil capacity 0.6 L (0.63 US. qt, 0.53 Imp. qt.)
Ignition system
Spark plug NGK: BPR7HS
Spark plug gap 0.7-0.8 mm (0.028-0.031 in)
Spark plug tightening torque 20 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.


  1. Dear sir/mam,

    Greetings. . .

    This is Arnold Data of Grand Base Ent & Technical Services, frm Manila , Philippines. I would like to inquire about your Yamaha Gas Engine with model MA190. May inknownthe price of this unit and how can i order? Please consider me as your dealer here.

    Thanks & best regards,

    Arnold Data
    Grand Base Ent & Technical Services
    No 247-A Ermin Garcia St, Brgy. Silangan,
    Cubao, Quezon City, Philippines, 1109
    Tel No 638-9129917
    Mobile No: 63917-5033894
    Email Add: gbsales.instruments@gmail.com
    Wechat: Arnold 032158

  2. I would like to see the power and torque curves (as function of engine speed) because I intend to operate at steady state in the 1600-2200 rpm range.

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