My 1400g male stopped eating this last July, and didn't eat for 6 months, and the entire time he was off feed he only lost 150g. (Obviously that weight loss is small relative to his initial weight. 150g would definitely be a major issue if the starting weight was 250g!) It is a good idea to monitor your BP's weight. If his weight is staying fairly steady during the fast, then there probably is not issue other than he doesn't want to eat because of breeding season, etc. If he isn't eating, and there is drastic weight loss then that is reason for concern. I don't know much about BP diseases (because luckily I have never had a sick snake), but that could be a possiblity related to rapid weight loss.
Do your snake a favor, and invest in a scale -- in my opinion probably one of the most important husbandry tools. I bought mine at Walmart http://www.walmart.com/ip/The-Bigges...acity/11090896 and I have also heard of people picking them up fairly reasonably on eBay.
Another great tool is Degie http://www.eyehit.com/degei/ which is a program where you can keep records of all of your snakes activity. A great way to monitor feeding and weight records, etc.
Good luck...I am sure your snake will be fine as long as husbandry is correct and you track his activity and watch for any warning signs.
George 
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