Spray a bit of aerostart into the carby and if it fires up, you are probably right about gung in the carby. A pressure pack of carby cleaner and a few simple tools will probably clean it okay. If it doesn't fire, take the plug out and with the lead reattached to it, hold it against the cylinder head and see if there is spark when you pull it over. Don't forget to move the throttle off the stop position. If there isn't, check if it is the plug by either changing it, or put a screwdriver in the end of the lead and see if a spark jumps then.
Try these couple of simple things and if no luck, get back to us with details. You will find a heap of knowledgeable and very helpful people here.
