FBRacing76
10-21-2004, 06:37 PM
Hey guys. It has been starting to get colder around here and my 400ex ran good all summer and I got on it today an rode it when I reved high when I was riding it spudered and backfired. I was running a 170 with open air box lip and DMC Full System, I just changed it to a 155. DMC's recomendations were 150-157. If any of you guys live in East/Central Us and run around the same set up let me know what your jetting is so I can get this figured out! Thanks!