05-21-2013, 02:39 AM
I was wondering about this too. I have a stock front and 64 rear sprockets, with fresh valve adjustment and throttle body sync on my f4i. A friend just setup a clean non abused f4i with -3 in the front (yes -3) and 66 in the rear and he says my bike is way too twitchy which I obviously noticed too especially after the throttle body sync.

