The carbs sound tops, rev like nuts, only had a backfire once when hitting full throttle returning to idle..
I'll look into using a spring tomorrow.
Using the electric pump from the CBR 900 and seems to be working great, no overflow and ticks along nicely...
I've got a gunson colortune on the way so that should at least tell me basic mixtures on each cylinder and prevent damage till I get a proper dyno.
Cheers!
Rob