T5 Crank with reed valve?

Hi!

If I´m going to use this crank with reedvalve, do I have to mill this crank or is it good to go like that..

 

Thx Kaarni

 

http://www.sip-scootershop.com/EN/Products/45100300/Racing+lip+crankshaft+Vespa+T5.aspx