Since taking carbs all apart, ultrasonic cleaning all jets, and a whole tin of carb cleaner !!!!, cotton buds and LOTS of time, to get all super clean.
got and modded some new stainless screws and made a long custom allen ket driver (to replace the silly screw head bolts that hold the carbs on the bike) plus a few other bits.....
Tonight finally reattached, the cleaned virgin carbs to the bike again. connected all hoses. Routed Choke in a different, better way (think it was routed wrong before!)
Rigged up a temp fuel container (made at work also)
double checked everything, looked nothing obvious out of place....
Tuned on ignition (on the bike that's not run, pretty much at all for 2 years, and would pretty much not start at all)
Pressed the starter, (assuming I'd have to wait for some fuel to get thru the system, if indeed it would even fire up at all)
And, Yessssssss, Instantly it fired up and started running. Few BANGS from one pot to start with, the odd crackle, but after a bit settled down....
Very happy

Was late, so could not run for long.
Air box not on, and could see the carbs working

Had the very very occasional POP and just a couple of flashes in the carbs! over the course of a few mins. Needs time to settle I'm sure, and Airbox will I guess help with the balance of the whole thing.
Couple of questions......
As I've removed the Carbs, and lost the coolant that was running thru the carbs, do you think I need to bleed the coolant system? (a pain) or may just be ok, topping up ?
Secondly, do you think I need to worry about balancing the carbs as I have no means to do it, and am not buying equipment just for a one-off use.