01 400ex Engine Diagram: An In-Depth Guide

If you’re a die-hard fan of the 01 400ex, you must know that the heart of this powerful beast is its engine. Understanding the engine’s internal workings can be quite a daunting task, especially for beginners. However, fret not, as we’ve got you covered. In this article, we’ll take a closer look at the 01 400ex engine diagram, and we’ll explain the different components that make this engine tick.

The Basics

Before we dive into the specifics, let’s first talk about the basics. The 01 400ex engine is a four-stroke, single-cylinder engine that’s capable of producing around 40 horsepower. It has a displacement of 397cc and a bore and stroke of 85mm x 70mm. The engine is cooled by a liquid cooling system and features a single overhead camshaft (SOHC) with four valves.

The Cylinder Head

The cylinder head is one of the most critical components of the engine. It houses the intake and exhaust valves, the camshaft, and the spark plug. The 01 400ex engine features a SOHC design, which means that there’s only one camshaft that operates the intake and exhaust valves. The camshaft is driven by a chain that’s connected to the crankshaft. The cylinder head also features a spark plug that ignites the fuel-air mixture.

The Piston and Connecting Rod

The piston and connecting rod are responsible for converting the reciprocating motion of the piston into rotational motion of the crankshaft. The piston is a cylindrical component that moves up and down inside the cylinder bore. It’s attached to the connecting rod, which in turn is connected to the crankshaft. The 01 400ex engine features a forged aluminum piston and a lightweight connecting rod, which helps reduce the overall weight of the engine.

The Crankshaft

The crankshaft is the backbone of the engine, as it converts the reciprocating motion of the piston into rotational motion. The 01 400ex engine features a one-piece forged crankshaft that’s designed to withstand high stresses and loads. The crankshaft is supported by bearings that are located in the engine case.

The Transmission

The transmission is responsible for transmitting power from the engine to the wheels. The 01 400ex engine features a five-speed manual transmission with a manual clutch. The transmission is attached to the engine and is located on the right-hand side of the engine case.

The Carburetor

The carburetor is responsible for mixing air and fuel in the correct proportions and delivering the mixture to the engine. The 01 400ex engine features a Keihin FCR 39 carburetor that’s designed to provide optimal performance at high speeds.

The Exhaust System

The exhaust system is responsible for removing exhaust gases from the engine and reducing noise levels. The 01 400ex engine features a high-performance exhaust system that’s designed to provide optimal flow and reduce backpressure. The exhaust system is composed of a header pipe, a mid-pipe, and a muffler.


Understanding the 01 400ex engine diagram is essential if you want to keep your machine running smoothly. Knowing the different components and how they work together can help you diagnose problems and perform maintenance tasks. We hope this article has provided you with a better understanding of the 01 400ex engine diagram. If you’re interested in downloading a free copy of the diagram, please click the link below.

[Download] 01 400ex engine diagram Free

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