The line pressure drop due to flow is only an issue during pedal movement - I agree with John that if you just consider the static cases at each end of the pedal motion then you can ignore the bore size. The only potential issue I can see from small bore would be that the clutch movement may be too "damped" - i.e when you release the clutch pedal it might return more slowly than you want due to losses in the pipe. I've gone with 6mm copper which is as per honda use on the type R I think? (except the small bore section over the transmission). I'm not talking from experience yet though because I haven't filled my clutch system yet!
On the subject of which - what's the total travel required at the master or slave cylinder to disengage? John - I saw you said you'd got 95% of the master cylinder travel available: does it need all that? I fear my setup currently has less.
Richard
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