At the drags on Thursday night at about 230 clicks I had a butt clenching massive tank slapping moment and have no real idea why.Had it happen again on another run later after a normal run through so it wasn't consistent.My initial though,after thinking I'm about to make a goose of myself and dump the bike in a straight line was it seemed to be at the point where the track surface changes at the end of 1/4(I was still hard on the gas at that point) or a front wheel balance issue ,but I have no educated idea.Anyone know any probable causes?