Alright, I know this post is kinda old but Im really needing some help. Is there a link someone has that shows stock jets? My 86' 250 sx is sputtering/bogging at WOT, the plug is black, and the air/fuel screw has no affect. I just bought a Shindy Carb re-build kit for the 86-87 250sx and put it toghter. The old jet that was in there was a 125 and the new one is a 130. I dont know of the pilot right now, have it writen down in garage but it idles pretty well. I put the 125 main back in because the bogg/ sputter got worse i think. It was noticable before now I cant ride it. Any advice? Should I go even further down in main jet size?