I stick with what has always worked for me.....Wiseco
As for the pro-x cylinders, I have seen many skirt failures.
I have never used the vertex pistons
theres all kinds of no namers on egay. i dont like paying for a name. if vertex and others are junk thats fine but if the quality is close to the hailed wiseco then what the hell ill try em. im very new to atvs so im definately not going to be beating the balls off it. anybody else have any first hand info on vertex or other lesser known pistons? good or bad?