Hi. After lurking for a while picking up masses of useful information (thank you all) I thought I'd ask a question. I'm a new MP3 400 owner in the UK. Very happy with the bike, after moving up from a GTS 250. My GTS was quicker of the mark though, and I miss that a bit (love loads of other things though). On this site and others I've narrowed simple upgrades to two, Dr Pulley 15gm weights, and J Costa variator. On the latter though, I haven't been able to track down whether they've managed to get this variator working optimally for the 400. Reports on early versions were mixed. What I'm after is slightly smoother and smarter early take off. I'm tempted by the cheapness and simplicity of the Dr Pulley option, but price isn't the main consideration if the J Costa is a better solution.
Look forward to hearing your thoughts, and many thanks for all the great contributions that I've read so far and that helped me in making the decision to move up in the first place.