🏍 RTT Class 2B Study Flashcards

Topic: Basic Structure of Motorcycle and Vehicle Maintenance

What is the main function of the engine in a motorcycle?

To generate power to move the motorcycle forward.

What is the function of the clutch in a motorcycle?

It connects and disconnects power from the engine to the gearbox.

What is the function of the gearbox in a motorcycle?

It provides different speed ranges and torque (power) to suit road conditions.

How is engine power transmitted to the rear wheel?

Through the drive chain and sprockets.

How are turning manoeuvres made on a motorcycle?

By using the handlebars and leaning the motorcycle.

What kind of engine motion is converted into rotary motion in motorcycles?

The reciprocating motion of pistons is converted into rotary motion.

What type of engine cycle do most motorcycles use?

The 4-stroke cycle (Induction, Compression, Power, and Exhaust strokes).

What happens during the Induction Stroke?

The piston moves down, the inlet valve opens, and a petrol–air mixture enters the cylinder.

What happens during the Compression Stroke?

Both valves close and the piston moves upward to compress the air–fuel mixture.

What happens during the Power Stroke?

The spark plug ignites the mixture, causing combustion that forces the piston downward.

What happens during the Exhaust Stroke?

The piston moves up with the exhaust valve open, pushing burnt gases out.

What is the purpose of engine oil?

To lubricate the moving parts and reduce friction in the engine.

What happens when the clutch lever is fully pulled in?

The clutch is disengaged — power is not transmitted to the gearbox.

What happens when the clutch lever is fully released?

The clutch is engaged — engine power is transmitted to the gearbox.

What is the purpose of the gearbox?

To regulate the motorcycle’s speed and torque according to road conditions.

When should lower gears be used?

For low speed, uphill riding, or moving off from a stationary position.

When should higher gears be used?

For cruising or maintaining higher speeds.

What is the function of the drive chain?

To transmit power from the gearbox to the rear wheel.

What type of brake system is used in most modern motorcycles?

Disc brakes that use hydraulic pressure to slow or stop the wheels.

Why are disc brakes preferred over drum brakes?

They dissipate heat faster and are less prone to brake fade.

What is the function of motorcycle tyres?

To provide grip, stability, and cushioning between the motorcycle and the road.

What is the legal minimum tread depth for motorcycle tyres in Singapore?

1.6 mm.

What can happen if tyre pressure is too high (over-inflated)?

Reduced grip, uneven tyre wear, and poor stability.

What can happen if tyre pressure is too low (under-inflated)?

Poor handling, higher risk of tyre damage, and reduced braking efficiency.

What should you do if your front tyre punctures while riding?

Stop immediately and push the motorcycle to the side of the road.

Why should damaged or worn tyres never be used?

They reduce traction and increase the risk of accidents.

What material difference affects tyre grip and durability?

Softer rubber provides better grip but wears faster; harder rubber lasts longer but gives less grip.

What are the main visible parts on the side view of a manual transmission motorcycle?

Mirrors, headlight, fuel tank, seat, engine, chain, tyres, main stand, and side stand.

What are the main components on the top view of a manual transmission motorcycle?

Speedometer, tachometer, clutch lever, throttle grip, front brake lever, gear shift pedal, horn switch, indicators, and exhaust/muffler.

Why are weekly checks important for motorcycle maintenance?

To ensure safe, trouble-free riding and prevent accidents caused by defects.

What should you check regarding fuel?

Ensure there is sufficient petrol and refill once the low-fuel indicator turns on.

When should you check engine oil level?

When the engine is cold and the motorcycle is upright on a flat surface.

How do you check engine oil with a dipstick?

Remove, wipe clean, insert without screwing in, then remove again to check the level.

What should you do if the oil level is below the lower mark?

Add the recommended engine oil until it reaches the upper level.

What is the proper amount of chain slack?

About 20 mm between full-slack and no-slack position.

What happens if the chain is too loose or too tight?

It may slip, break, or cause loss of control.

What tyre conditions should be checked weekly?

Air pressure, tread depth, and any damage or abnormal wear.

What is the correct free play for the front brake lever and rear brake pedal?

Between 15 mm and 20 mm.

How should brake fluid levels be checked?

Front brake reservoir: above LOWER level mark Rear brake reservoir: between LOWER and UPPER level marks

What should you do if brake fluid is low?

Top up immediately and have the braking system checked.

What is the correct clutch lever free play?

Between 10 mm and 20 mm.

What should you do if your throttle gets stuck while riding?

Pull in the clutch lever, turn off the engine, and apply the brakes.

What should you check for in motorcycle lights?

That headlight, tail light, brake light, hazard lights, and indicators are all functioning properly.

Is it legal to ride with faulty or non-functioning lights?

No, it is illegal and unsafe to do so.

What is considered an illegal modification to a motorcycle?

Replacing, adding, or removing components that change it from manufacturer’s specifications without LTA approval.

What is an example of an illegal modification?

Removing or altering the exhaust catalytic converter, or installing a loud aftermarket exhaust.

Why does LTA regulate vehicle modifications?

To maintain safety, control noise and exhaust emissions, and protect the environment.

What are the penalties for illegal motorcycle modifications?

A fine up to $2,000 and/or imprisonment up to 6 months.

Why is it important not to carry out unauthorized modifications?

It can void your insurance, cause mechanical failure, and result in legal penalties.