Whats the difference between these two?

[Shadow7874]

When i was looking on wisecos site their forged pistons were much more expensive then the prox ones but there is only a small price difference between these two. Am i missing something?
http://www.parkeryamaha.com/pro-xtopendpistonrebuildkityamaha.aspx
http://www.parkeryamaha.com/wisecoyamahahighperformancepistonkit.aspx

Also if i get one of the kits what else will i need? My crank and head are both being replaced as well. Do i need new bearings for the pistons or can i use my oem ones if they are good?

 

[Shifty]

From what I have read here, most choose to go with the Pro-X. I have read they need less time to warm up and are cheaper as well.

 

[augustaf]

Most of all the cast ProX are dimensionally stable.

 

[Big Kahuna]

Cast vs Forged.

different animals.

ProX is just like the OEM.

 

[Waternut]

Wiseco's are some of the best pistons you can get but the majority of us don't need them. One thing to point out between those two kits is the wiseco kits don't come with wrist pin bearings so you'd have to reuse yours...not a big deal but that is one difference I noticed.

 

[BombThreat]

Ive bought Pro-x, Wiseco, and WSM all required wrist pin bearings bought separately. Maybe you bought your Pro-X as a topend kit?