I have a 2007 drz400 e, bike alwayas ran great. Yesterday I was riding, Just got outside of town, about 10 miles, turned a corner while I was getting on the throttle, the bike started sputtering, backfired then died, wouldn't start. Made a call and got it back home, thought it could be fouled plug, changed the plug and still wont start. Any Ideas on what it could be? It has plenty of gas.