Couple guys already said that they hear some sort of knocking sound and they say its normal? Hmm.... what can you say? Can you tell me how did it go on your bike?
Upgrading to 57MM is not a bad idea at all. Its just that since I'm upgrading it, why not just go for the bigger bore (sorry I'm that greedy...lol) Seriously, I'm not sure if this is ok to the whole bike it self.