1979 Yamaha 750 Special won't start, cranks repeatedly, but then backfires loudly.?

josh w

New member
Got the bike a week ago, saw it start and run perfectly, loaded it in my truck, took it home, unloaded it, now it won't start. It cranks well, till the battery dies, then I charge it, and start the process all over again. It also will backfire loudly while cranking. I have tried turning both petcocks (the left and the right) to all different positions. What is going on?
 
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