Troy Bilt was bought out by Mtd , most of the old stuff is hard to get, Tecumseh went out last year ,but was bought this year we can still get some parts ,
You need to clean the carb , mark all linkage holes before taking
carb off , 631028b is part # for needle and seat and bowl gasket,
630740 oring you may need 2 if it has 2 adj screws , the one on bottom
is main jet start off at 1 1/2 turns out . the more turned out the richer it runs. the side screw is the low speed adj start out at 2 turns , it only
will make a change at low speed .;
there are very tiny holes in the side of the bowl nut or main jet screw adj make sure the are open .
http://www.kunzmowerservice.com
good luck