I was wondering when i will need to do a top end on my blaster. It was just broken in a few weeks ago, and ridden only a few times. How reliable will my 240 big bore be? My friend rebuilt his blaster, and a month later it blew up again. The guy i bought it from took it to a shop to get it bored out. How hard will it be to do a top end? I have done a top end on a 4 stroke.