Website regarding making head ports for motorcycle smaller for more power??

Question

guy used to race as an independent and was beating manufacture bikes by closing up the ports instead of opening pollishing them. He tells how to do it yourself at home...cant think of the website.. Help.

Answer 1

That would be Moto Man!

http://mototuneusa.com/thanx.htm

Answer 2

The key to performance is to have the port properly sized and shaped for the given application. Bigger is not always better, and can actually reduce horsepower.