Hey guys ... Ive been trying to figure out why my bike is jerking alot and wont even start sometimes now ... It jumps and jolts when trying to start ... If it starts it jerks real bad for almost the whole ride and sometimes it even shuts off the bike ... Hope its not toast ... Hasnt started at all today ... Its a 2 stroke 66 cc slant head ... About 200 miles ... New carb ... Just like the one it came with ... Please help