valves or carbs?

[JayRo]

I have a 99 B12 with 11k miles on it.  I bought it with about 9K on it and I decided to adjust the valves since I wasn't sure when it was done.  There are a lot of mysteries with this bike.  Bear with me and I will quickly touch on its history.  
When I first got it, the plugs would foul out after about 200 miles or so.  I thought everything was stock but when I pulled the carbs off to check them, I found them with 127.5 mains, adjustable needles, etc.. Everything that would indicate a jet kit.  What kind?  Who knows.  I didn't mess around with setting too much.  I figured with the stock exhaust, I should jet down.  So I got some 112 mains and the bike ran fine after that (I left the pilot jets alone).
Since my downsize of the main jets, I have added a yosh bolt on, and did the home made 5 degree advance mod.
I decided to adjust the valves this season before I started riding a lot.  So I did em'.  Like the clymers book said and I checked each valve about three times.  While I had the bike torn down and considering the small advances I had done, I decided to put back in the 127.5 mains.  It must be the testosterone and the fact that I live only an hour from deals gap.  
Anyway, I got back everything together and took it for a test ride. With the bike warmed up, it seems like my idle circuit is lean.  When you blip the throttle a little ( not opening it past a 1/4) it seems to hang up at its apex and slowly drop back down to idle speed.  I tried adjusting the air/fuel mixture but it didn't yield the results I was looking for.  
So I guess the question is did I miss something?  Can valves have an effect on your mixture? I doesn't make sense.

[solman]

I doubt it.  With stock settings, the Bandits are known to run on the lean side.  Also since you added a yosh pipe, it just added to the problem.  While typically a slip on doesn't require a jet kit, I am sure that you are running on the lean side.  Adjusting the needle would probably help it out some for starters, especially since you adjusted your air/fuel screw.  BTW, did you turn your screw out or in?

[JayRo]

Sometimes I get so involved that I overlook the obvious.  In my case, it is called "throttle free play". That is what was causing my "hang up" and slow decel to idle.  
I am curious though, on most jet kits, are you supposed to use the stock plastic spacer under the clip? I just took my bike for a short ride and I am waiting until it cools down a little so I can check the plugs and see if it is burning rich or lean.

[Red01]

I am curious though, on most jet kits, are you supposed to use the stock plastic spacer under the clip?

I know you keep the spacer with the Holeshot kits, not sure about the others, haven't dealt with them yet.

[zeebandit]

Factory Pro and Ivan's keep the plastic spacers.