Check the overheat switch, my 1992 650 would start than die after 5 minutes and would not start,I would have spark for the first few turns than none,I would let her sit for a hour and would start up and again die, check that you have spark always as turning over. If your starder is not working I would check the overheat switch for sure or kill switch. It turn out in my case that it was the CDI,got the entire box with CDI on ebay for $150.00 dealer price for CDI $340.00, and I think the guy has another one for sale,hope this helps, Bornfree