Yamaha MA175

The 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
Model	MA175
Type	4-stroke, OHV, single cylinder
Displacement	174 cm 3 (10.6 cu-in)
Max. horsepower	4.5 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
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 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 type	Yamalube 4-stroke or an equivalent (SE or SF)
Recommended oil	SAE 10W-30, 10W-40
Oil capacity	0.5 L (0.53 US. 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)