which is the best cyl for a 250r? 330? 350 powervalve? mostly for duning and play racing

whats the best place to port it as well? carb kits? etc...

best web sites for the best parts? thanks

 

You cant go wrong with getting a 310 or 330 complete kit from ESR. For what you get and how much it cost, it's a great deal. Maybe not the fastes but reliable and fast.

 

anything with a powervalve is great. I really like the 350pv bike the 330pvs run well too. Price esr is probably a cheaper company out there, but there products work well and are priced so people can buy them. The might not be the best, but they are a great deal for the money you spend and they work well with each other.