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
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)
Author: Sergei Wers
About: Co-founder and CEO of a multi-brand auto repair shop (engine repair, chassis repair, body repair and painting) for over 15 years. I have been developing internet sites with technical specifications for more than seven years.

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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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