Bike just went over 14,000 miles. Had the bike fully serviced and the valves adjusted about 2 weeks ago. Rode fine until I started the bike up this morning. Revved up normally to warm up, but sputtered and died soon after. Bike starts back up but sounds like its not funning on all cylinders and dies when I give it gas. Carbs were cleaned out about 3 months ago. No clue. Any help?