Bike is running only on 3 cylinders

[Disorderlypunk]

draining off the carb always best way to go where posibleooh yeah thats your problem right there
go straight to the float and float needle valve my guess is its simply closing far too early or even just sealed shut and that 7ml was just sitting there
or there could be some crap behind the needle valve but a quick blow through the fuel line will show that (just block the other 3 fuel needles)