00:00Motorcycles of today are the true marvels of engineering.
00:05A basic model of inner parts of a typical motorcycle is shown here.
00:09In this video we will explain the basic function of each of these parts in a motorcycle.
00:15Let's begin from how a motorcycle engine starts.
00:19All motorcycles have either a kickstarter or a self-starter or both.
00:24A kickstarter mechanism is simple yet interesting.
00:28As the kickstarter lever is descended, a helical spline forces the gear to slide and engage with a freewheeling gear on the main shaft.
00:36As the lever is descended further, the gear spins on its axis and transfers the power to the clutch hub.
00:42The clutch hub transfers the power to the crankshaft and eventually to the engine.
00:48In a self-starter system, a battery-powered motor provides initial spin to the engine.
00:54Once the engine is started, the starter motor has to be disengaged from the crankshaft to prevent damage due to excessive speed.
01:02This is achieved by using a one-way clutch.
01:05The model shown here is of a roller-type one-way clutch.
01:09It has an outer race and an inner race with small rollers.
01:13As the starter motor spins the outer race in one direction, the rollers get trapped between the surfaces and the power is transferred to the inner race and thus to the crankshaft.
01:25Once the inner race starts spinning faster than the outer race, the rollers get released, causing the inner race to spin freely.
01:33Like every four-stroke gasoline engine, motorcycle engines require a source of ignition to ignite the air-fuel mixture for power strokes.
01:42A spark plug is used for this purpose.
01:45The spark plug requires voltage in excess of 20,000 volts to fire properly.
01:50In this particular model, the voltage is obtained from the stator of the motorcycle, although a 12-volt battery may be used for the same purpose.
01:58The stator is a stationary coil of wires.
02:03The flywheel of the motorcycle has a set of permanent magnets which revolves around the stator and produces alternating current in the coils.
02:12Each output from the stator has different purposes, as shown here.
02:17The output for the ignition purpose is received from the exciter coil.
02:22This coil has a denser winding of thinner wire than the other coils to produce higher voltage for the ignition.
02:29This voltage is supplied to an electrical component known as the capacitive discharge ignition, or CDI unit.
02:37The connection for an AC-CDI is shown here.
02:40The primary function of the CDI unit is to store electric charge and dump the stored charge when required.
02:46A capacitor inside the CDI unit stores the electric charge.
02:50Another component, known as a pickup coil, tells the CDI unit when to dump this charge.
02:55The pickup coil has a small magnet with a coil of wire around it.
03:00The flywheel has a small extrusion on its outer surface.
03:03As this extrusion approaches and passes the pickup coil, a small voltage is developed in the coil.
03:10This voltage is supplied to the CDI unit, which closes an electronic switch known as a silicon-controlled rectifier, or SCR.
03:20This will dump all the charge from the capacitor through the output of the CDI unit.
03:25To increase the voltage further, an ignition coil is used.
03:29The ignition coil is a step-up transformer which increases voltage up to 200 times the input voltage,
03:36which is sufficient to fire the spark plug.
03:40Several other factors contribute to the continuous operation of the engine.
03:45The intake and exhaust valves are controlled by using a timing chain, as shown here.
03:51As long as the engine is running, the crankshaft rotates and transfers power to the other components for proper operation.
03:58Single-cylinder engines generally use a counterbalance to reduce the vibration caused by unbalanced forces.
04:05The clutch helps in smooth transfer of power from the crankshaft to the transmission system.
04:11The transmission system helps in altering the speed and torque, as per our requirement.
04:17The transmission system helps it tightly covers wardMorch.
04:26The transmission system keeps order to move through.
04:29The agua transfer outside control is a second Singh byicht Bulimorch.
04:33First clicks below the playback phase and flexches.
04:35We'll use theelia- ะฟัะพะด position to verify that the drive trifier ISO turns from a static force- sฤฑrrorder bridgeX counter-
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