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Michael Hinojosa

on 8 November 2014

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Transcript of DIRT BIKES

I dedicate this to my mom,
my brother, and my dad,
who taught me everything
i need to know about
dirt bikes.
By:Michael Hinojosa
History of dirt bikes

History of dirt bikes
In 1885,a man named Gottlieb Daimler invented the gas engine. He put it on a machine that had looked like a bicycle.

History cont.
All of it was made of wood,
including the wheels. Daimler's son Paul had gone and tested it. He zoomed of at seven miles per hour(mph). This nine-year old was the first motorcycle rider!

Have you ever ridden a dirt bike and know the parts of
one? If not, this will tell the key aspects you would need to know about dirt bikes. This will tell you about 2-strokes and 4-strokes and their differences. You will learn about the history of the first dirt bike/motorcycle.It will talk about the different types of bikes and their cc engine sizes and where they are manufactured. By the end of this, you will know things about the dirt bike that you probably didn't know before.

History cont.
Early motorcycles were not very
comfortable. The seats were made of steel. These early motorcycles were called "Boneshakers". They did not springs and their suspension was bad. They would also bump over bad roads.

Types of cc dirt bikes

What does "cc" mean?
The displacement of an internal
combustion engine (ICE) is usually measured in cubic centimeters, or cc's. The number of cc's in an engine is written as 500cc which is equal to half a liter, or 30.5 inches.The total number of cc's can be in one single cylinder or spread across multiple cylinders. Usually in even numbers to maintain balance, but not always.

Types of cc bikes
CC dirt bikes range from small to big.
The smaller the cc, the less powerful it is .
And the bigger the cc is, the more powerful it will become. A small list of dirt bikes from small cc's to big cc bikes with it's brand is given below.
PW 50-Yamaha
CRF 70F-Honda
KX 85-Kawasaki
KX 125-Kawasaki
RM 150-Suzuki
RM 250-Suzuki
WR 450F-Yamaha
2-strokes and 4-strokes

A two stroke engine has three strokes combined into one
action, meaning the intake and exhaust are both integrated into the compression movement of the piston, therefore eliminating the need for valves. This is thanks to an inlet and exhaust port integrated into the wall of the combustion chamber.As the piston goes down from combustion, spent gasses are allowed to exit the chamber through the exhaust port. The air–fuel mixture is drawn through an inlet located lower in the chamber. As the piston rises again, it blocks off the inlet and exhaust ports, compressing the gasses at the top of the chamber. The spark plug fires and the process starts over. The engine fires on every revolution. Because of this, 2-strokes are really good in the sand.

During the intake stroke, the piston goes
down from the top of the cylinder to the bottom, reducing the pressure inside the cylinder. It then draws a mixture of fuel and air into the cylinder through the intake port, ready for the compression stroke. With both intake and exhaust valves closed, the piston goes back up to the top of the cylinder compressing the fuel-air mixture. This is what happens during the compression stroke.The compressed air–fuel mixture is then ignited by a spark. The pressure from the fuel-air mixture combustion drives the piston back down with humongous force, keeping the crankshaft turning. This is the power stroke phase, which is the main source of the engine's torque and power.Finally, during the exhaust stroke, the piston again goes up and pushes the burned gas from the cylinder out the exhaust valve. Another thing worth mentioning is that the spark plug only fires once every two revolutions.

Different brands of dirt bikes
There are many different, popular brand types of
dirt bikes. Some popular brand types are KTM, Kawasaki, Honda, Yamaha, Suzuki, Husaberg, and Husqvarna.
Suzuki Dirt bike
Yamaha Dirt Bike
Husqvarna Dirt Bike
Honda Dirt Bike
Husaberg Dirt bike
KTM Dirt Bike
Parts of a dirt bike engine

Carburetor-part of a gasoline engine in which liquid fuel is converted into a vapor and mixed with a regulated amount of air for combustion in the cylinders.
Piston rings-Seals the space between the piston and the cylinder wall, so the force of the gasoline/air mixture igniting pushes the piston down, rather than just "blowing by" the piston and losing lots of power.
Crankshaft-The crankshaft is located in the engine of a vehicle and converts the force created by the engine's pistons moving up and down into a force that moves the wheels in a circular motion so the bike can go forward.
In conclusion, the dirt bike is a
complicated machine. But I hope you learned from the key aspects of the dirt bike. And I hope from this, you actually learned something that you might not have known about dirt bikes before you watched this. :)
Full transcript