Hi. I’m having some issues with my bike. I recently bought it from a guy who told me the bike sat up for a period of time. I’ve changed the spark plugs, the battery, gotten a oil change. changed the fuel filters,the starter clutch, had the carburetor rebuilt and the bike runs for a good 2 mins then shuts off. Also the front cylinder gets extremely hot to the point of smoking. The bottom pipe is severely hot and the top is fairly cold. Please help dying to get back on the road thanks!!!