What is a 2 stroke dirt bike?

Answer 1

A 2-stroke engine requires that you mix oil with your gas where a 4-stroke engine uses gas straight out of the pump. A 2-stroke engine does not have any valves and therefore, weighs less than a 4-stroke engine. 2 strokes fire once for each revolution whereas a 4-stroke fires once every other revolution. 2 stroke engines are easier to maintain (less moving parts - no valves, no oil pump, etc.) However, you do have to mix your gas, they are less efficient and much worse for the environment, because there is constantly unburned oil and fuel passing through to the exhaust.

yeh, basically a 2 stroke engine has one powerstroke in every 2 strokes of the piston. a power stroke is the piston stroke that provides the power, the spark plug fires and forces the piston downwards. so the 2 stroke cycle is basically compression, power, compression, power etc.

it uses the start and end of these 2 strokes to also perfrom intake and exhaust.

whereas a 4 stroke has one powerstroke for every 4 strokes of the piston. its cycle is intake, compression, power, exhaust.

INTAKE - intake valve(s) open and as the piston moves down and suck in charge (mix of fuel and air), the intake valve(s) then close

COMPRESSION- the piston moves upwards compressing the charge, at the top of this stroke the spark plug fires

POWER- and ignites the charge forcing the piston downwards. EXHAUST- the exhaust valve opens and the piston moves upwards and forces the exhaust out.