300/440/550 550 backfires and waterbox explodes???

Hey guys, another 550 question...I was riding my ski today and it ran great, i shut it off for about 15 mins and then went to start it back up, it back fired and the waterbox blew up. now it wont even try to start, it just backfires. it has spark and i am trying to start it by putting a little premix in the carb. would the waterbox being blown up keep it from even starting with the hood off? I dont want to put another waterbox in only to blow it up again. any ideas???? thanks

Luke
 
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