iv just bought a yamaha ty250 help me please its playing up?

iv bought a yamaha ty250 was told its pre "85 just got it started as he said its bin sat there and not used for months and the exhaust front has been welded lots of times and it was very smokey and smoke from the front pipe please help
i was told its a 4 stroke , but it its premixed either its straight petrol but the engine and engine casing was very hot but its bin in the sun all day so i dont know if thats it or what
 
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