The Yamaha MX300 is a 296 cc (18.0 cu-in) single-cylinder air-cooled 4-stroke internal combustion general-purpose gasoline engine with horizontal shaft manufactured by Yamaha Motor Co., Ltd.
The Yamaha MX300 engine has a hemispherical combustion chamber with V-valve layout; float type carburetor; centrifugal flyweight governor; mechanical splashing lubrication system; Transistor Controlled Ignition (T.C.I.) and recoil or electrical (option) starter. The starter knob position can be adjusted by each 45°. Microwave harden crankshaft and camshaft provide extremely long life. The high-tech exhaust valve (Stellite® coated and tufftride® finished) resists very high temperature.
The cylinder bore is 80.0 mm (3.15 in) and the piston stroke is 59.0 mm (2.32 in), compression ratio rating is 8.4:1. The engine produced 9.5 PS (7.0 kW) at 3,600 rpm of maximum horsepower and 7.9 PS (5.8 kW) at 3,600 rpm of continuous rated power. Maximum torque is 20.3 N·m (2.07 kg·m, 14.97 ft·lb) at 2,400 rpm of torque.
4-stroke, Hemi-head OHV, single cylinder
296 cm 3 (18.0 cu-in)
9.5 PS (7.0 kW) at 3,600 rpm
Max. torque (crank PTO)
20.3 N·m (2.07 kg·m, 14.97 ft·lb) at 2,400 rpm
Transistor Controlled Ignition (T.C.I.)
Recoil or Electrical (option)
Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity
5.5 L (1.45 US Gal, 1.21 Imp Gal.)
PTO shaft rotation
Counterclockwise (from PTO shaft side)
Dimensions and Weight
Length, mm (in)
Width, mm (in)
Height, mm (in)
Dry weight, kg (lb)
Intake valve clearance
0.10 mm (0.004 in)
Exhaust valve clearance
0.10 mm (0.004 in)
Yamalube 4-stroke or an equivalent (SE or SF)
SAE 10W-30, 10W-40
1.0 L (1.06 US. qt, 0.88 Imp. qt.)
Spark plug gap
0.7-0.8 mm (0.028-0.031 in)
T.C.I. air gap
0.4 ± 0.2 (0.016 ± 0.008)
Spark plug tightening torque
20 N·m (2.0 kg·m, 14 ft·lb)
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