Where you went wrong? If the head was done right the motor will fell like a electric motor. Power clear through with no hard hits. The web cam will take away your bottom end and move the power up the RPM band. Kind of sounds like the first time I built a motor. I mismatched parts to. Remenber the rule, cam, carb, header, port work. Make shure they are all for the same RPM range.

 

Attn! 400EX Owners...
Check out this post. It has what I was telling you about earlier-