I've recently got a 1997 cbr918. It started and ran good about 6 times. Blew no smoke, idled nice. I started it every 2 days or so. Now it won't start on me. I charged the battery up. It cranks over nice but won't go. It's got fuel and fuel is flowing out of valve ok. It has a funny poping coming from exhaust while I'm trying to start it. I know it's a long shot but any ideas ? Fuses seem ok.