Join Date: May 2010
Location: Calgary, Alberta, Canada
This is normal for this bike, but it is curable. The first thing you will want to do (this one is free to you but takes a bit of time) is the ground fix. Make sure all of the grounds are clean and solid. Make sure the battery terminals are tight. Put some dielectric grease on the grounds after they are done to keep the elements out. This can help the situation a lot.
Fueling on the VTX 1800 is not that good at the throttle opening you are experiencing this at. It's clear Honda never thought much riding would be done there, but as you no doubt know, sometimes you just have to. Someone had mentioned a CheapShot, Cobra has the FI2000 and there are others. If you richen up the fueling at the low end, this problem is mostly masked. It amazed me how well this worked to smooth the condition out. It would appear that the bike is a bit lean at that throttle opening. This can be made even worse with increased air flow introduced by an intake and exhaust.
As you have no doubt red here, a fuel manager is not absolutely necessary, but it can help to smooth things out a bit.
'12 Road Glide Ultra, Kuryakyn Alley Cat intake, Jackpot Super Duals header, Jackpot HiRoller mufflers, PV Tuner, Daymaker LEDs