Piston decision CR250

[shredda]

I have a few questions regarding Wiseco and Vertex pistons for an 03 CR250. I have the "B" cylinder. Couldn't find exactly what I wanted with a search.
1. Will the Wiseco piston have tight enough tolerances for the "B" cylinder. I want the piston to cylinder clearance tight?
2. Does either piston manufacturer offer benfits over the other (i.e. performance or longevity)?
3. Vertex offers 4 different piston sizes (66.34-66.37) for my bike, would I go with the largest size piston for my "B" cylinder? Thanks for you help.

 

[psycho]

I too would like to know. I am looking at doing a top end and never used the Vertex piston before and wonder if it is as good as well as the tolerances. Anyone??

 

[marcusgunby]

You need to measure the piston and the bore really to get the exact size right, on wisecos i generally put them in a run them-with no problems-dont go for the biggest vertex-it maybe too big.Vertex make good pistons that last well-neither has any big advantages over the other.