Any weed-eater guru's out there?

can i get a little info on a weedeater aswell??? i have a tanka 2501 that is fireing but will not start..i put some gas in the cylinder but still got nothing even shoot some starting fluid in it and nothing.. i dont really want to buy a new weedeater cause this 1 has been so good to me and it is super lite.. been had it since 1998/99 when i has my lawncare business......i thought the coil was gone but pulled the plug wire and plug and i get spark... mike