Yamaha MX400

Yamaha MX400The Yamaha MX400 is a 402 cc (24.5 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 MX400 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, camshaft and balancer shaft with dual bearing support provide extremely long. The high-tech exhaust valve (Stellite® coated and tufftride® finished) resists very high temperature. To be pushed the crank down directly, the cylinder arranged off from the crankshaft center.

An 85.0 mm (3.35 in) cylinder bore and 71.0 mm (2.79 in) piston stroke give the engine a total of 402 cc of displacement. Compression ratio rating is 8.2:1. The engine produced 12.8 PS (9.4 kW) at 3,600 rpm of maximum horsepower and 10.6 PS (7.8 kW) at 3,600 rpm of continuous rated power. Maximum torque is 28.7 N·m (2.9 kg·m, 21.2 ft·lb) at 2,400 rpm of torque.

General information

Engine Specifications
Model MX400
Type 4-stroke, Hemi-head OHV, single cylinder
Displacement 402 cm3 (24.5 cu-in)
Max. horsepower 12.8 PS (9.4 kW) at 3,600 rpm
Max. torque (crank PTO) 28.7 N·m (2.9 kg·m, 21.2 ft·lb) at 2,400 rpm
Carburetor Float type
Cooling system Forced-air
Ignition system Transistor Controlled Ignition (T.C.I.)
Lubricating system Mechanical splashing
Starting system Recoil or Electrical (option)
Fuel used Unleaded gasoline (octane number 86 or higher)
Fuel tank capacity 6.1 L (1.61 US Gal, 1.34 Imp Gal.)
PTO shaft rotation Counterclockwise (from PTO shaft side)

Dimensions and Weight

Yamaha MX400
Length, mm (in) 418 (16.5)
Width, mm (in) 462 (18.2)
Height, mm (in) 464 (18.3)
Dry weight, kg (lb) 33.0 (72.7)

Service Information

Valve clearance
Intake valve clearance 0.10 mm (0.004 in)
Exhaust valve clearance 0.10 mm (0.004 in)
Oil system
Oil type Yamalube 4-stroke or an equivalent (SE or SF)
Recommended oil SAE 10W-30, 10W-40
Oil capacity 1.1 L (1.16 US. qt, 0.97 Imp. qt.)
Ignition system
Spark plug NGK: BPR4ES
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)
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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