hi, im looking at this current blaster on a craigslist ad, and i need help. first off the guy told me that when he first got it he rode it for 30 minutes then it started bogging down and shut off and wouldnt turn back on. he said he asked his friend whos good with engines to look at it. he told him that the blaster needs to have the top end rebuilt. he had it rebuilt and it would not start for him so he gave up on it. i need opinions on what it could be and how expensive it could end up to fix it 