yo shouldnt have that problem if its jetted correctly and it has the right lubricatin, dont waste bores on banshee jugs only bore when you HAVE too, stupid of him to say bore it over or you will continue to have this problem because bore has nothinng to do with it blowing up.
didnt say that to be a dick, im still learning about them and boost bottles are junk, k&n filter with no lid, or maybe pod filters, v force reeds, adjustable timming plate, mill the head alot of things you can do, i havnt touched my sprokets i just bought new stock ones.