v3's and the reeds... just think of them as a 1 way valve(if u know what that is...), the piston sucks in air/fuel mixture when the piston goes up, then the piston comes down and pushes the air/fuel mixture back against the reeds and they close, compressing the mixture then its shot up into the cylinder to be ignighted. air goes in 1 way but cant go back.
am i right? correct me if im wrong but that sounds right.