My 2008 500 with efi is taking to long to start. The motor is turning over fast so the starter is not the problem. I have to try to start it 4 or 5 times before it does start then it runs find. I have drain fuel tank and change fuel filter. the 4 wheeler has about 980 miles on it. When the bike was new it would start right up. thanks for help or advice on fixing this problem.