OK I replaced the plug and it started right up and idles great. However now it's stuttering around 60-0% throttle. I pulled the air filter and it will then raise up to about 80-90% but stutters heavily. The exaust has a heavy fuel smell. it's not getting air correctly?? or spuratically?
 I went ahead and ordered a new filter but it seems that it's still more than that. I tried the mix screw back and forth but it didn't give me much in either direction. Any suggestions?

 So now I'm trying to guess why this would be flowing too rich now though. At least enough to run this badly. A month ago it was running "ok". Although the only time i took it out for more than 20 minutes it died on me.
 So do you figure the new petcock combined with a clean carb is now allowing it to run better and now it's getting too much fuel? So i need to lower the jet? Since it's running great on idle do you think I just need the main jet changed?

Thanks

Ok well I know there are tons of posts about re-jetting but I'm trying to look at the manual and figure out which one I need. The manual shows that there are 3 different carb types? but they are all BS40SS ?? Are those 3 just different full setups for the bike?
 Also in the Main Jet line it has SC17 and I've tried internet searches for that and I'm coming up with nothing. However on the Mikni website:

http://www.psep.biz/store/mikuni_main_jet.htm

They show plenty of them and that leaves me with a new questions. So i need the small hex or the large round and how would you tell? I'm guessing those 2 because they are the only two with the 155. I'm almost positive the one on there now is round but I'm just trying to learn WHY these are different and not just do it because the book says so.
 Last little question. Should I move down to the 150 and maybe grab a 145 just in case?

Thanks again.