Your supposed to notch the frame for the chain when you do a 240 conversion. Your fine, nothings wrong with your bike other than you having grind alittle on the frame to make room for the chain. NO, it will not break your frame or cause any harm to the bike. Every 240 kit has the frame notching deal. Yep, that means all the Busa's you see with 240's have notched frames. There were a few 240 kits made to avoid notching the frame, but it offset the rear wheel to the right side too much and looked like crap.