The 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.
4-stroke, OHV, single cylinder
189 cm 3 (11.5 cu-in)
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
Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity
PTO shaft rotation
Counterclockwise (from PTO shaft side)
Dimensions and Weight
Length, mm (in)
Width, mm (in)
Height, mm (in)
Dry weight, kg (lb)
Yamalube 4-stroke or an equivalent (SE or SF)
SAE 10W-30, 10W-40
0.6 L (0.63 US. qt, 0.53 Imp. qt.)
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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