Have a 95 blaster bought it new in 95 ran fine no problems till 08 then motor gave out so i rebuillt it and on the first ride it blew up again melting the front piston so i had the crank replaced and rebuilt it again and yet again it blew up melting the front cylinder so i thought i did somthing wrong upon the rebuild and did it one more time and it melted it again.. checked the cylinder for cracks and found none what else could it be??????