quick question

[ttrmotocross]

Hi i have a 2000 yz125 and i was just wondering: what is a power valve and what does it do? there's 2 in the front of the cylinder and I was just wondering why they're there and why the four strokes don't have them. thanks for the info.

 

[MXer666]

http://en.wikipedia.org/wiki/2-stroke_power_valve_system

 

[ttrmotocross]

alright thanks i know it's kind of a dumb question and i don't wanna waste anyone's time