valve springs?

[red03400]

would you have to change your valve springs if you bought a cdi box that makes it rev. to 10300 rpm (for a 400ex)??

[COOTERGUY]

IT SHOULD HANDLE IT. THOUGH YOU WOULD KNOW REAL FAST IF YOU WERE FLOATING THE VALVES OUT.

[Bill Fuller]

As long as it is the stock cam or a drop in cam than the stock springs will be fine.