Hi, could be your engine has seized up, you may have had excessive piston and bore ware (piston slap,tinkling noise under acceleration) and possibly small end gone (rattling) If you can get the top end apart and the little end eye in the con rod looks OK, you may be able to get away with a rebore, new piston & rings, gudgeon pin and small end bearing for not too much cash. Better check that debris (broken rings,bits of piston) hasn't fallen into the crankcase, that won't be good! It'll cost much less than £500 if you DIY. Good luck.
peewee
March 2010