I am putting a 426 11:1 kit in my 400ex, i have the hd studs and cometic gaskets, was thinking of replacing the timing chain with a crf450 one but i just replaced my stock.. Im also not going to have an aftermarket cam for a little bit and have to stick with stock. I have an WB e series slip on and a UNI filter with open lid. Question one would be, is it neccesarry to get a stronger timing chain? Question two, am i going to hurt anything running the stock cam? What kind of powerband would there be with stock?

 

If you have a new (stock) timing chain it will be fine. Same with the cam, stock will work just fine. When you do put the stage 2 in it will feel like a different machine.