resently purchast 27 t touring barn fresh sitting 40-50 years have it turning over fireing but poping through carb and back fireing has vaperizer carb help please
Good start;
http://www.mtfca.com/discus/messages/29/8538.html
Welcome, Robert. You didn't say this is your first T, but just in case it is here are a couple of links for you.:
http://dauntlessgeezer.com/DG79.html
http://dauntlessgeezer.com/DG80.html.
Probably stuck valves. Pull the valve cover and spray oil on them and slowly get them to move up and down one at a time. Of course, do this with the engine off.
You can also pull the spark plugs and watch the valves from there to see which are sticking. Can also squirt some penetrating oil on the valve stems with the valves open that way.