cr125 reeds????

It's for more flow. MOST engines don't require it.

It's really as you get into aggressive porting and high end pipe on a stroker crank or BBK on a stroker crank. I have CR125 reeds installed on my vito's versus a stock reed cage because it flows enough setup the way it is for the stock reed cage (and more specifically stock style 4 petal reeds!) to be a flow restriction.