Hello I've had my 05 v's carbs apart several times this week and my problem still won't quit. Ever since I installed dynojet kit and put on the monster dual exhaust its had an issue with sputtering and stumbling at around 1/4 throttle from the front cylinder. I've gotten a lot of info from this site and checked out the usual things like the valves, dirty carbs, missing rice sized jets in the diaphram, shimming the needles, and sticky chokes and everything is good. Here's the thing, I covered up the intake on the front carb partially with my hand and it completely fixes the stumble at 1/4 throttle. If I do the same on the rear carb it dies almost instantly. What could I change in the front carb to fix the issue? Also, once past 1/4 throttle the thing runs great no problems at all. I've lived with the problem for a while now and I just want to get it running smooth around the low end. I have a k&n as well with stock internals and ignition. Live at sea level in sw FL. Any insight would be greatly appreciated.