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Most motorcycles use a four-stroke engine because it balances performance with fuel efficiency.
 The four strokes are:
Intake – pulls in air and fuel
Compression – squeezes the mix tightly
Power – ignites the mix to create motion
Exhaust – clears out used gases
During intake, the engine pulls in a mixture of air and fuel. Then, the piston compresses the mixture tightly inside the cylinder.A spark plug ignites the mixture, causing a tiny explosion that pushes the piston down—this is the power stroke. Finally, the exhaust stroke clears out the burned gases so the cycle can start again.

This entire process happens thousands of times per minute while the engine runs. When you twist the throttle, you’re controlling how much air and fuel enter the engine. More throttle means more explosions, which means more speed. Each “bang” inside the cylinder is controlled, precise, and essential to your ride. Understanding how your engine works helps you detect early signs of trouble.

 Here are a few symptoms and what they might mean:
Hard to start – weak spark or fuel issue
Rough sound – compression or timing problem
High fuel use – dirty air filter or poor combustion

This entire process happens thousands of times per minute while the engine runs. When you twist the throttle, you’re controlling how much air and fuel enter the engine.