The subject of the choke circuit has not been touched yet - which richens the mixture significantly when engaged.
Did you test to see if moving the choke lever forward and back, actually opens and closes the choke circuit at the carbs? Are you starting it with or without the choke engaged? You did mention the plugs were wet with fuel - is there a heavy fuel smell at the exhaust when you attempt to start it?
I would identify whether or not the choke lever is actually working properly, so that you KNOW
for sure whether or not it is engaged when you try to start - the choke may
be engaged all the time and you may be just flooding it every time - when you pulled the carbs, did you verify the floats could move freely, and not maybe get stuck? This can add "fuel to the (no) fire", so to speak.
Also, before the first time it wouldn't
start, had anybody disconnected any of the plug wires, at the plugs OR
at the coils? If these are not corrected right, you will
get spark, but not at the right times
After it has been sitting for a while, long enough for some fuel to evaporate, in the event that it might have been
flooded, I would hold your throttle wide open with the choke disengaged (lever toward the front of the bike) and try to crank it over for a bit, not re-twisting the throttle, but keeping
it wide open during the whole attempt. This will help it to start if it is
If that doesn't work, wait a bit, and then (mind you, all this depends on knowing if the choke lever is doing it's job) try to start it with no throttle, and the choke fully engaged (lever toward the rider), and see which one of these methods gets more "catches" - that might
narrow down if you're getting too much fuel, or not enough fuel.
One last thing
, and this is just a shot in the dark, but, since we don't know your knowledge and skill level with regards to carburetion - when you cleand the carbs, did you remove the mixture screw for the pilot circuit? And, if you did, did you screw them all the way in and leave 'em that way, or did you then back them out 2 - 3 turns? Don't be offended by this question, like I said, we have no idea what you do or do not
know about carburetion.
Good luck, and keep us posted!