Yamaha MA175

Yamaha MA175The Yamaha MA175 is a 174 cc (10.6 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 MA175 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 49.0 mm (1.89 in), compression ratio rating is 8.5:1. The engine produced 4.5 PS (3.4 kW) at 3,600 rpm of maximum horsepower. Maximum torque is 10.0 N·m (1.02 kg·m, 7.38 ft·lb) at 2,400 rpm.

General information

Engine Specifications
Type4-stroke, OHV, single cylinder
Displacement174 cm 3 (10.6 cu-in)
Max. horsepower4.5 PS (3.4 kW) at 3,600 rpm
Max. torque (crank PTO)10.0 N·m (1.02 kg·m, 7.38 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 MA175
Length, mm (in)415 (16.3)
Width, mm (in)360 (14.2)
Height, mm (in)270 (10.6)
Dry weight, kg (lb)12.5 (27.6)

Service Information

Oil system
Oil typeYamalube 4-stroke or an equivalent (SE or SF)
Recommended oilSAE 10W-30, 10W-40
Oil capacity0.5 L (0.53 US. 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.

ATTENTION! Dear visitors, this site is not a trading platform, an official dealer or a spare parts supplier, so we do not have any price lists or spare parts catalogs. We are an information portal and provide the technical specifications of gasoline and diesel engines.

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. Hello Sergei,
    Thank you, a great site and very informative too. I am looking for the specification for the crankshaft end float or free movement in the crankcase of the crankshaft. I am unable to find anything although there must be a limit.

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