Bought A 2001 Triumph Thunderbird After Not Having A Bike For 20yrs. My How Things Have Changed.

Are the plugs looking carbon fouled when you remove them after running for a while? float hight could still be too high giving rise to over rich mixture, are you sure the pilot fuel jets and air passages are clear?

 

To identify the carbs, you will find the carb id number etched / stamped on the side of the carb, this corresponds to the id number in the parts listing here

http://www.worldoftriumph.com/triumph_motorcycle_parts_catalogue?model_id=16485