As wobbly said, you will need porting, but for any1 whos knows, what does this involve?? What do you change the size of?
cranks not in stock mate EDIT: I know eveyone hates people postin ebay links all the time but... http://cgi.ebay.co.uk/gilera-runner-dra ... dZViewItem
No-one will tell you what to port. its a secret art. and your best bet is to trust someone with your brand new bore kit and let them set it up for you. if i were you i would get chatting to minor