pv or big bore kit

[250rbadboy]

which one is more reliable and why?which one produces more power?looking to up grade to a ESR kit and dont have a clue about eather one!!!!!:confused:

[ESR350r]

Depends on what you want to do, MX or XC you want a PV so you have a smooth transition to the powerband, Non-pv cylinders hit hard when they hit the powerband.

[GOTFEAR]

that right