Quote Originally Posted by alanTDM
I use to be a member of the MSN Thundercat group but here is a link to the new site will have lot of info on there http://www.yamaha-thundercats.org/f39-the-workshop.
Might be worth joining
I'll see you there kidder, I'm on with the same forum name...

Oh and just to mess with your head google "Thundercat 660cc build" (actually it might be american so try "YZF600r 660cc build", that'll get you thinking, mixture of use of conrods and pistons from FZR and FZS I believe and a different side casing will give you 660cc and a mid more mid range again... Apparantly.. Good write up if you can find it