Bor  ho raha hun,,,, koi achha question nahi hai..

Urs is ok..

See stroke denotes the sound or precisely the steps involved in working of an internal-combustion engine!!

It involves:

sparks fly(in situ)

followed by fuel intake

and compression stroke...

While in four stroke engines,, there is:

intake stroke

compression stroke

power stroke

exhaust stroke

Dekha,, ki four stroke mein power stroke bhi hai,, in this electrical contact is unestablished which creates spark for ignition...

You can now see that two-stroke engines have two important advantages over four-stroke engines: They are simpler and lighter, and they produce about twice as much power. So why do cars and trucks use

? There are four main reasons:

• Two-stroke engines don't last nearly as long as four-stroke engines. The lack of a dedicated lubrication system means that the parts of a two-stroke engine wear a lot faster.
  

   

  
  


• Two-stroke oil is expensive, and you need about 4 ounces of it per gallon of gas. You would burn about a gallon of oil every 1,000 miles if you used a two-stroke engine in a car.
  

   

  
  


• Two-stroke engines do not use fuel efficiently, so you would get fewer miles per gallon.
  

   

  
  


• Two-stroke engines produce a lot of pollution -- so much, in fact, that it is likely that you won't see them around too much longer.
  

  The pollution comes from two sources. The first is the combustion of the oil. The oil makes all two-stroke engines smoky to some extent, and a badly worn two-stroke engine can emit huge clouds of oily smoke.

  
  

These disadvantages mean that two-stroke engines are used only in applications where the motor is not used very often and a fantastic power-to-weight ratio is important.

Isse jyada nahi samjha sakta!!