My 08 250sx has died the last two times I went out. Just bogged out and died as if there was no fuel, but tank was at least half full. First time I got home and changed the spark plug and it ran fine. Second time out same thing, just bogged out and died after 1/2 hour of riding. Am I missing something obvious? I run a 45:1 mixture, maybe just bad gas, I don't know, any ideas?