I have a 2005 R6 with 18800 miles on it and I'm having a bit of an issue. I'm getting a loud "thud" sound when shifting from first to second. I can audibly hear it and feel it in my foot while shifting at low and high RPMs. It feels like there's a lot of resistance. Going from second to third isn't as bad, but the problem is still there. From third up, it feels smooth, and what I would call normal. Any ideas guys?