after installing a 430 big bore kit, headporting and jeting. my XR430 decided to break a rod!! destroying bothe case's, the cylinder , piston and bending several shifting shafts and bending the counter shaft! completely destroying the motor! this was after 12+ HARD rides. if your gonna go big bore and POWER, GET A NEW ROD!!!i will get pics of all of it. just to let you guys see a nasy rod break. anyone gotta spare xr engine???