I'd have to say I'm with Pat on this one as far as the 904 conversion is concerned. However, that's not to say that your 865cc T100 wouldn't benefit from one of the other big bore kits out there. I'm afraid I'm a little scetchy on their details but, offhand, I gather they range from about 980cc to as much as 1100cc (possibly more even with a kit to alter the stroke in addition to the bore).
I'll have a little look and see what I can find on the subject and get back to you.
Meanwhile, I must confess I did rather plump for the Wiseco 904 kit before having really spent enough time researching the other options available. Though having said that, I'm very happy with the improvement in performance that it has given over the 790cc I had before. Any additional performance gains due to my tinkering have been more down to good luck than good judgement really, but there we are - sort of like a confused octopuss fiddling with a marine anti-ship mine and somehow coming away alive.
In a couple of days I'm off down to Yorkshire to get it dyno-tuned, rejettted and all that so I expect to get a bit more yet. As with the above, I'll let you know how it goes.
