dolt
Well-Known Member
will the 50mm bolt on in place of the 58mm? I have this same kit. Mine runs fine. Tuned by doc's hd in St.Louis I was told I couldn't change because a smaller tb would not bolt up to the larger ports. My only reason for changing would be to see if I can get a little faster throttle response.
I would look elsewhere for a solution. I believe when you refre to throttle response you may actually be experiencing the tall gearing of the '09 model as well as the softnes of the 260/259 cams that were installed with the kit.
A cam change and/or a trans pulley change to a 30T, or both, will wake things up.