No article about how a motorcycle works is complete without having an understanding of how to start a motorcycle in the first place. In order for a motorcycle to start it needs fuel, air, and a spark. The fuel is squirted into the engine by one of two methods. Most older motorcycles use carburetors and most modern and up motorcycles have fuel injection. A carburetor gets its fuel supply from the fuel tank through one or two small hoses.
The carburetor squirts a small amount of fuel and pushes air into the combustion chamber of the engine. The combustion pushes the piston down and spins the crankshaft. Fuel injection motorcycles are more reliable and easier to start in all temperature conditions. Fuel injection simply means that the fuel is pressurized and squirted more forcefully into the combustion chamber, whereas carburetors depend on engine suction power to pull the fuel and air in.
Motorcycles usually have between one and four cylinders. So this combustion sequence can be happening 4 times in a row very quickly, over and over again. So if someone says they have a four cylinder it means there are 4 combustion chambers and 4 pistons in their engine. All motorcycles are either electric start or kick start.
An electric start motorcycle has a small button on one of the hand controls that will let send power to the start and turn over the engine, making it start. But a lot of older motorcycles and dirt bikes only have a kickstart. This is a lever on the right side of the motorcycle that connects by the right foot peg. A kickstarter takes some practice to get used to. Put the motorcycle in neutral by clicking the gear lever all the way down and then up half of a click. It can roll the motorcycle forward and make it tip over, I have seen people do it plenty of times.
For electric start motorcycles as well, always make sure you are in neutral when you start it. Some motorcycles will lurch forward when you hit the start button and you can crash into something.
For safety reasons just make sure you always start the motorcycle in neutral. The next thing to learn about is how to accelerate from a stand still. Once the motorcycle is started and in neutral you pull the clutch lever with your left hand and click the gear lever down once. You can feel the click if you get it right. Once it is clicked into first gear you slowly let go of the clutch lever and slowly twist the throttle your right handlebar.
The key word is slowly. The balance of a motorcycle is the same as a bicycle. As you slowly accelerate, put both of your feet on the footpegs. Your right foot controls the rear brake and your right hand controls the front brake. Go slowly at first and just stay in first gear. Learn how to properly balance and practice things like stopping and starting, turning left and right, and using your hand controls like the horn and turn signals.
So the crank has a cog, or gear, on the end of it, which turns a bunch of other gears of different sizes — and we can select which one we want, using a clever mechanism called a gear lever — before the drive appears, slower but much more forcefully, at an output gear — and from where we can hook a chain round it and drive the back wheel.
Now your bike has a running engine, and is moving. This is a drawing of a Triumph Trophy engine. You can see thre three pistons in a line, each on the end of a con rod and turning the crank beneath. You can also see the two inlet and exhaust camshafts across the top of the motor, actuating the valves. The big gear just behind the clutch basket is picking up drive from the crank and passes it into the gearbox — the cluster of gears. The drive output is the helical bevel gear at the bottom right.
The Trophy has a shaft drive, and you can see its helical bevel gear picking up the gearbox output. Of course, all the above only describes the process of one piston, rod and cylinder. They can be arranged in weird and wonderful ways — next to each other parallel twins, or inline threes, fours or sixes , in a V shape V-twin or V-four , or facing each other flat twin, flat four, even a flat six.
Because of this, some configurations of cylinders suit specific types of riding — so single cylinders work well in dirt bikes but not so well in touring bikes.
V-fours make good sportsbike engines, but lousy off-road engines. Of course, this is only the most basic outlining of the way your bike engine works. Each engine has its own strengths and its own design quirks; it might be supercharged, or have variable valve technology, or a semi-automatic gearbox.
The beautiful thing about a four-stroke engine is when you gaze at a drawing of one, or an animation on Youtube, and suddenly understand for the first time the magical interconnection of piston, rod, crank, camshaft and valves.
How does a motorcycle internal combustion engine work? Motorcycle Engine Basics The story starts with a bang inside a small, confined space.
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Some UTI graduates get jobs within their field of study in positions other than as a technician, such as CNC operator, apprentice machinist, and machined parts inspector. For program outcome information and other disclosures, visit www. See Table 1. Bureau of Labor Statistics, www. Students are responsible for any other costs such as lab fees associated with the course. Bureau of Labor Statistics projects an annual average of 61, job openings between and Job openings include openings due to net employment changes and net replacements.
Bureau of Labor Statistics projects an annual average of 43, job openings between and Bureau of Labor Statistics projects an annual average of 24, job openings between and Bureau of Labor Statistics projects an annual average of 13, job openings between and Bureau of Labor Statistics projects an annual average of 11, job openings between and Bureau of Labor Statistics projects that total national employment for Automotive Service Technicians and Mechanics will be , by Bureau of Labor Statistics projects that total national employment for Automotive Body and Related Repairers will be , by Bureau of Labor Statistics projects that total national employment for Welders, Cutters, Solderers, and Brazers will be , by Bureau of Labor Statistics projects that total national employment for Computer Numerically Controlled Tool Operators will be , by Bureau of Labor Statistics projects the national average annual job openings in each of the following occupations between and will be: Automotive Service Technicians and Mechanics, 61,; Bus and Truck Mechanics and Diesel Engine Specialists, 24,; and Welders, Cutters, Solderers, and Brazers, 43, Universal Technical Institute of Illinois, Inc.
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