hi guys, i have a 2005 cat 250. I was gonna go for a ride to but the lil refused to start. Would for for a sec, then die repeadtly, seein how it has sat sometime, i decided to drain the fuel,and put fresh fuel in. Well the only thing i got was a fire craker type sound from the exhuast. I pulled the plug,and it was quit black. Cleaned it the best i could, and still wouldnt start. But it did have a burp like sound. Well pick up another plug tomorrow and try that, if it still refuses to start, where would i look next?