Dirt bikes give you a new level of adventure with rough rides on rocky, bumpy, muddy, dusty, and rough roads. A stroke is the up and down movement of the piston in the dirt bike engine. The most difficult choice one has to make while buying a dirt bike is between a 2 stroke Dirt bike and a 4 stroke Dirt bike.
The dilemma and debate between 2 stroke vs 4 stroke are as old as the Dirt bike itself. To differentiate between the two bikes, first, it’s important to understand what a two-stroke Dirt bike is and what a four-stroke bike is.
2 stroke vs 4 stroke dirt bike, which is better?
2 Stroke Dirt bike
How does it work?
In simple terms, a two-stroke dirt bike has two strokes (up and down movement of the piston in the engine) involved in the movement of the engine. A two-stroke does a four-step work with only two piston strokes.
The starting point for working a 2 stroke engine is called a power stroke. The power stroke makes the fuel, air, and oil mixture push the piston downward, and the mixture then reaches down to the exhaust port.
When the piston is pushed further downwards, the mixture is pushed into the crankcase. The intake transfer Port is exposed, and another batch of fuel mixture enters the cylinder; along with the next rotation of the crankshaft, the piston is pushed back.
When the piston is pushed back, the Intake transfer Port is closed, and the fuel mixture is compressed again. This compressed mixture ignites the fuel charge with spark plugs, and the cycle repeats itself repeatedly.
Pros and cons of a 2 stroke Dirt bike
4 stroke Dirt bike
How does it work?
A four-stroke engine has four strokes (up and down movement of the piston in the engine) involved in the movement of the engine. The four main steps are intake, compression, combustion, and exhaust.
- Intake stroke: The piston is pushed downwards during the intake stroke, creating a vacuum in the compression chamber, which opens the inlet valve and closes the exhaust valve. The fuel and air mixture enters the compression chamber.
- Compression stroke: The compression stroke starts when the internal pressure of the compression chamber becomes equal to the outer pressure as the piston moves upward; the temperature and pressure increase after air and fuel compression.
- Combustion/power stroke: After the compression stroke, the air-fuel mixture is ignited with the help of a spark plug. When the fuel is burning, power is generated, and the piston moves backward due to the expansion of the chemical reaction. This reaction increases temperature and pressure, leading the piston to move downwards, driving the crankshaft.
- Exhaust stroke: After the power stroke is completed, the exhaust stroke starts and pushes the piston upwards, opening the exhaust valve(the Inlet valve remains closed), and exhaust gasses are pushed out.
After completing the exhaust stroke, the piston again moves downwards, and the air-fuel mixture is sucked again, repeating the whole cycle repeats.
Pros and cons of a 4 stroke dirt bike
A two-stroke dirt bike or a four-stroke Dirt bike has advantages and disadvantages. It’s not easy to choose between both of them. But every rider has their requirements or expectations for their perfect dirt bike.
Bikes have different performances in different situations, settings, and rider preferences. Therefore one should keep in mind their requirements and then go for the perfect match.