Not go kart related, but need some advice. Mower took forever to start and ran like crap end of last season. Last week I removed and cleaned carb, replaced filter and plug, drained old gas. Cut front lawn last week and mower ran like a champ and like new!!! Go to cut back grass today and it runs for 5-10 seconds and dies. Only way it runs for 5-10 seconds now is if I prime it. Any ideas? Thanks, Adam.....