i have a late 80's 743 and recently it has ran great. today i got it out and it ran for about 5 minutes before dying. well long story short it would start with the help from the primer ball and then die. so i took the fuel pump off and took apart to find one of the little plastic discs was broken. 1st question: does anyone know where i can find a rebuild kit online and 2nd question: would this cause rough starting? it takes about 2 30 s tries to get it fired up. but once it fired up it ran perfect.