ahhhh the valve clearances will no doubt be too tight.take the panel off that is behind your feet as you sit on the bike(its black and plastic)there you will see a squarish shaped metal cover with 4 bolts holding it on and a small pipe joined to it undo the pipe and undo the bolts and lift the cover off turn the engine over with the kickstart until both the cam lobes are facing diagonally inwards or down and then set the clearances to .05mm for the inlet and .08mm for the exhaust then try again !the exhaust always tightens up.
adam bike doctor(of milton keynes motorcycle centre), October 2010
