Hi Mike,
Thanks for that info. Interesting you should comment on the mid range, which is where I like my power to be, mine doesn't seem to have much go at all, but perhaps I'm expecting too much from it. The inside of the original silencer is shot, so I've sourced an alternative the same length. (mine has the standard 2 into 1 exhaust system), I'll comment if it makes any difference. I've been keeping my eyes peeled for a IOM exhaust, but I think I have more chance of catching the Loch Ness Monster!.
If you are ever cleaning your carb, please do keep a note of your jetting/needle etc and forward it, if I had that I think I might take the plunge and purchase a Keihin. That would be much appreciated, but please don't strip your carb if there's no need to, if it aint broke don't fix it!, and there's not much of our already shortened riding season left here in Scotland anyway.
Cheers and thanks,
Alan.