1vj wont start from cold for love nor money

[odannyboy]

hi im new here so firstly hello!,
my 1vj tenere600 wont start from cold at all.the story is...
i bought the bike as a basket case and have spent literally three years building it up in spare time.
only reliable way of starting it now is lots of easy start,fully charged battery,use leckky start button and hope for the best.when it fires hold revs up till it warms up.when hot its fine( well for a ageing 600 single)
its had;
bore honed-compression is v good but not totally run in yet
plug
valve clearences are correct to best of my knowledge
carbs have been apart and cleaned inc the tiny hidden filter
carb rubbers are old but i think there good
valves ground in and all top end overhauled.
timing is correct to best of my knowledge( it runs when hot ok)
standard exhaust fitted if a bit welded up etc due to its age

i belive its a fuel prob.plug is never soaking wet when removed but you can smell fuel.i am using the standard fuel pump.ive neard bypassing can be worthwhile tho never tried it (again it runs when warm) there is an inline fuel filter that i added before the pump.didnt know if this could restrict the flow to the pump?the choke apearrs to make no difference at all.when the bike is warm and idling ive pulled it out,presuming it would then be to rich and stall, but this doesnt happen.no change.have had carbs apart and looked in passageways, blown thro with an air line etc.seemed ok?
so im thinking mixture is really lean or rubbers are leaking or somethings wrong in the carb or fuel supply to the carb maybe??? only thing that gets me is its fine when hot???
what gets me is the total lack of starting, i mean its nothing not even the odd bang.nothing.and thats with the leckky start.with the kick you wont get anything at all.this is fairly true when hot too.kick rarely ever works.its start button or a push really.
pls pls give me some advice, ive spent so may long nights trying to find out whats wrong and ive fixed so many other things and other peoples bodges im so sick of it now.im sure that is actually just a simple thing and its so close to being spot on.cheers dan